From 1fde0d9e38ba039ab2e531c5f508d5fe6b6dd169 Mon Sep 17 00:00:00 2001
From: Shefali Joshi <simplyrender@gmail.com>
Date: Sat, 18 Jan 2025 07:50:24 -0800
Subject: [PATCH 1/4] Don't disallow mouse events when in compact mode for
 plots (#7975)

* Allow highlights and locking highlight points for plots in compact mode, but still disallow pan and zoom.

* Remove unnecessary watch on cursor guides and grid lines

* Test for cursor guides in compact mode
---
 .../plot/plotControlsCompactMode.e2e.spec.js  | 58 +++++++++++++++++++
 src/plugins/plot/MctPlot.vue                  | 46 ++++++++-------
 src/plugins/plot/PlotView.vue                 |  8 ---
 3 files changed, 84 insertions(+), 28 deletions(-)
 create mode 100644 e2e/tests/functional/plugins/plot/plotControlsCompactMode.e2e.spec.js

diff --git a/e2e/tests/functional/plugins/plot/plotControlsCompactMode.e2e.spec.js b/e2e/tests/functional/plugins/plot/plotControlsCompactMode.e2e.spec.js
new file mode 100644
index 0000000000..d9700c60cb
--- /dev/null
+++ b/e2e/tests/functional/plugins/plot/plotControlsCompactMode.e2e.spec.js
@@ -0,0 +1,58 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2025, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+/*
+ * This test suite is dedicated to testing the rendering and interaction of plots.
+ *
+ */
+
+import { createDomainObjectWithDefaults } from '../../../../appActions.js';
+import { expect, test } from '../../../../pluginFixtures.js';
+
+test.describe('Plot Controls in compact mode', () => {
+  let timeStrip;
+
+  test.beforeEach(async ({ page }) => {
+    // Open a browser, navigate to the main page, and wait until all networkevents to resolve
+    await page.goto('./', { waitUntil: 'domcontentloaded' });
+    timeStrip = await createDomainObjectWithDefaults(page, {
+      type: 'Time Strip'
+    });
+
+    // Create an overlay plot with a sine wave generator
+    await createDomainObjectWithDefaults(page, {
+      type: 'Sine Wave Generator',
+      parent: timeStrip.uuid
+    });
+    await page.goto(`${timeStrip.url}`);
+  });
+
+  test('Plots show cursor guides', async ({ page }) => {
+    // hover over plot for plot controls
+    await page.getByLabel('Plot Canvas').hover();
+    // click on cursor guides control
+    await page.getByTitle('Toggle cursor guides').click();
+    await page.getByLabel('Plot Canvas').hover();
+    await expect(page.getByLabel('Vertical cursor guide')).toBeVisible();
+    await expect(page.getByLabel('Horizontal cursor guide')).toBeVisible();
+  });
+});
diff --git a/src/plugins/plot/MctPlot.vue b/src/plugins/plot/MctPlot.vue
index 76815cc53d..08e2a6f3d0 100644
--- a/src/plugins/plot/MctPlot.vue
+++ b/src/plugins/plot/MctPlot.vue
@@ -164,11 +164,13 @@
           <div
             v-show="cursorGuide"
             ref="cursorGuideVertical"
+            aria-label="Vertical cursor guide"
             class="c-cursor-guide--v js-cursor-guide--v"
           ></div>
           <div
             v-show="cursorGuide"
             ref="cursorGuideHorizontal"
+            aria-label="Horizontal cursor guide"
             class="c-cursor-guide--h js-cursor-guide--h"
           ></div>
         </div>
@@ -854,13 +856,11 @@ export default {
 
       this.canvas = this.$refs.chartContainer.querySelectorAll('canvas')[1];
 
-      if (!this.options.compact) {
-        this.listenTo(this.canvas, 'mousemove', this.trackMousePosition, this);
-        this.listenTo(this.canvas, 'mouseleave', this.untrackMousePosition, this);
-        this.listenTo(this.canvas, 'mousedown', this.onMouseDown, this);
-        this.listenTo(this.canvas, 'click', this.selectNearbyAnnotations, this);
-        this.listenTo(this.canvas, 'wheel', this.wheelZoom, this);
-      }
+      this.listenTo(this.canvas, 'mousemove', this.trackMousePosition, this);
+      this.listenTo(this.canvas, 'mouseleave', this.untrackMousePosition, this);
+      this.listenTo(this.canvas, 'mousedown', this.onMouseDown, this);
+      this.listenTo(this.canvas, 'click', this.selectNearbyAnnotations, this);
+      this.listenTo(this.canvas, 'wheel', this.wheelZoom, this);
     },
 
     marqueeAnnotations(annotationsToSelect) {
@@ -1115,19 +1115,21 @@ export default {
       this.listenTo(window, 'mouseup', this.onMouseUp, this);
       this.listenTo(window, 'mousemove', this.trackMousePosition, this);
 
-      // track frozen state on mouseDown to be read on mouseUp
-      const isFrozen =
-        this.config.xAxis.get('frozen') === true && this.config.yAxis.get('frozen') === true;
-      this.isFrozenOnMouseDown = isFrozen;
+      if (!this.options.compact) {
+        // track frozen state on mouseDown to be read on mouseUp
+        const isFrozen =
+          this.config.xAxis.get('frozen') === true && this.config.yAxis.get('frozen') === true;
+        this.isFrozenOnMouseDown = isFrozen;
 
-      if (event.altKey && !event.shiftKey) {
-        return this.startPan(event);
-      } else if (event.altKey && event.shiftKey) {
-        this.freeze();
+        if (event.altKey && !event.shiftKey) {
+          return this.startPan(event);
+        } else if (event.altKey && event.shiftKey) {
+          this.freeze();
 
-        return this.startMarquee(event, true);
-      } else {
-        return this.startMarquee(event, false);
+          return this.startMarquee(event, true);
+        } else {
+          return this.startMarquee(event, false);
+        }
       }
     },
 
@@ -1158,11 +1160,15 @@ export default {
     },
 
     isMouseClick() {
-      if (!this.marquee) {
+      // We may not have a marquee if we've disabled pan/zoom, but we still need to know if it's a mouse click for highlights and lock points.
+      if (!this.marquee && !this.positionOverPlot) {
         return false;
       }
 
-      const { start, end } = this.marquee;
+      const { start, end } = this.marquee ?? {
+        start: this.positionOverPlot,
+        end: this.positionOverPlot
+      };
       const someYPositionOverPlot = start.y.some((y) => y);
 
       return start.x === end.x && someYPositionOverPlot;
diff --git a/src/plugins/plot/PlotView.vue b/src/plugins/plot/PlotView.vue
index 34eac98331..48395b4dbf 100644
--- a/src/plugins/plot/PlotView.vue
+++ b/src/plugins/plot/PlotView.vue
@@ -162,14 +162,6 @@ export default {
       }
     }
   },
-  watch: {
-    gridLines(newGridLines) {
-      this.gridLines = newGridLines;
-    },
-    cursorGuide(newCursorGuide) {
-      this.cursorGuide = newCursorGuide;
-    }
-  },
   created() {
     eventHelpers.extend(this);
     this.imageExporter = new ImageExporter(this.openmct);

From a6517bb33e94360ff35df6af917a2802a6d21acd Mon Sep 17 00:00:00 2001
From: Shefali Joshi <simplyrender@gmail.com>
Date: Fri, 7 Feb 2025 10:03:00 -0800
Subject: [PATCH 2/4] migrate from actions/upload-artifact: v3 to v4. (#8000)

* migrate from actions/upload-artifact: v3 to v4.
https://github.com/actions/upload-artifact/blob/main/docs/MIGRATION.md

* Add names for artifacts and allow overwriting them
---
 .github/workflows/e2e-couchdb.yml     | 10 +++++++---
 .github/workflows/e2e-flakefinder.yml |  4 +++-
 .github/workflows/e2e-perf.yml        |  4 +++-
 .github/workflows/e2e-pr.yml          |  4 +++-
 4 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/e2e-couchdb.yml b/.github/workflows/e2e-couchdb.yml
index edab4e9fb4..dd4fce54cc 100644
--- a/.github/workflows/e2e-couchdb.yml
+++ b/.github/workflows/e2e-couchdb.yml
@@ -51,7 +51,7 @@ jobs:
         env:
           COMMIT_INFO_SHA: ${{github.event.pull_request.head.sha }}
         run: npm run test:e2e:couchdb
-      
+
       - name: Generate Code Coverage Report
         run: npm run cov:e2e:report
 
@@ -66,15 +66,19 @@ jobs:
 
       - name: Archive test results
         if: success() || failure()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
+          name: e2e-couchdb-test-results
           path: test-results
+          overwrite: true
 
       - name: Archive html test results
         if: success() || failure()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
+          name: e2e-couchdb-html-test-results
           path: html-test-results
+          overwrite: true
 
       - name: Remove pr:e2e:couchdb label (if present)
         if: always()
diff --git a/.github/workflows/e2e-flakefinder.yml b/.github/workflows/e2e-flakefinder.yml
index 09c912f424..c6eaffe748 100644
--- a/.github/workflows/e2e-flakefinder.yml
+++ b/.github/workflows/e2e-flakefinder.yml
@@ -38,9 +38,11 @@ jobs:
 
       - name: Archive test results
         if: success() || failure()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
+          name: e2e-flakefinder-test-results
           path: test-results
+          overwrite: true
 
       - name: Remove pr:e2e:flakefinder label (if present)
         if: always()
diff --git a/.github/workflows/e2e-perf.yml b/.github/workflows/e2e-perf.yml
index 36285589b1..afa8147409 100644
--- a/.github/workflows/e2e-perf.yml
+++ b/.github/workflows/e2e-perf.yml
@@ -35,9 +35,11 @@ jobs:
       - run: npm run test:perf:memory
       - name: Archive test results
         if: success() || failure()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
+          name: e2e-perf-test-results
           path: test-results
+          overwrite: true
 
       - name: Remove pr:e2e:perf label (if present)
         if: always()
diff --git a/.github/workflows/e2e-pr.yml b/.github/workflows/e2e-pr.yml
index 869fd2dfbf..897434480e 100644
--- a/.github/workflows/e2e-pr.yml
+++ b/.github/workflows/e2e-pr.yml
@@ -45,9 +45,11 @@ jobs:
           npm run cov:e2e:full:publish
       - name: Archive test results
         if: success() || failure()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
+          name: e2e-pr-test-results
           path: test-results
+          overwrite: true
 
       - name: Remove pr:e2e label (if present)
         if: always()

From ecd120387cb43bec08b542732f6873fb658e211c Mon Sep 17 00:00:00 2001
From: Shefali Joshi <simplyrender@gmail.com>
Date: Mon, 10 Feb 2025 13:46:00 -0800
Subject: [PATCH 3/4] Independent time conductor related handling for plot
 synchronization. (#7956)

* Ensure that the mode set when independent time conductor is enabled/disabled is propagated correctly.
Also ensure that global time conductor changes are not picked up by the independent time conductor when the user has enabled it at least once before

* Use structuredClone instead of deep copy

* Add e2e test

* Assert that you're in fixed mode after sync time conductor

* Comment explaining new time context test

* Change test to be a little less complicated

* Fix linting errors
---
 .../plugins/plot/plotControls.e2e.spec.js     | 38 +++++++++++++++++++
 src/api/time/IndependentTimeContext.js        | 22 ++++++++++-
 src/api/time/TimeAPI.js                       |  6 ++-
 src/plugins/plot/MctPlot.vue                  |  1 +
 .../independent/IndependentTimeConductor.vue  | 12 +++++-
 5 files changed, 75 insertions(+), 4 deletions(-)

diff --git a/e2e/tests/functional/plugins/plot/plotControls.e2e.spec.js b/e2e/tests/functional/plugins/plot/plotControls.e2e.spec.js
index 87f608f528..e654ff213d 100644
--- a/e2e/tests/functional/plugins/plot/plotControls.e2e.spec.js
+++ b/e2e/tests/functional/plugins/plot/plotControls.e2e.spec.js
@@ -108,4 +108,42 @@ test.describe('Plot Controls', () => {
     // Expect before and after plot points to match
     await expect(plotPixelSizeAtPause).toEqual(plotPixelSizeAfterWait);
   });
+
+  /*
+  Test to verify that switching a plot's time context from global to
+  its own independent time context and then back to global context works correctly.
+
+  After switching from fixed time mode (ITC) to real time mode (global context),
+  the pause control for the plot should be available, indicating that it is following the right context.
+  */
+  test('Plots follow the right time context', async ({ page }) => {
+    // Set global time conductor to real-time mode
+    await setRealTimeMode(page);
+
+    // hover over plot for plot controls
+    await page.getByLabel('Plot Canvas').hover();
+    // Ensure pause control is visible since global time conductor is in Real time mode.
+    await expect(page.getByTitle('Pause incoming real-time data')).toBeVisible();
+
+    // Toggle independent time conductor ON
+    await page.getByLabel('Enable Independent Time Conductor').click();
+
+    // Bring up the independent time conductor popup and switch to fixed time mode
+    await page.getByLabel('Independent Time Conductor Settings').click();
+    await page.getByLabel('Independent Time Conductor Mode Menu').click();
+    await page.getByRole('menuitem', { name: /Fixed Timespan/ }).click();
+
+    // hover over plot for plot controls
+    await page.getByLabel('Plot Canvas').hover();
+    // Ensure pause control is no longer visible since the plot is following the independent time context
+    await expect(page.getByTitle('Pause incoming real-time data')).toBeHidden();
+
+    // Toggle independent time conductor OFF - Note that the global time conductor is still in Real time mode
+    await page.getByLabel('Disable Independent Time Conductor').click();
+
+    // hover over plot for plot controls
+    await page.getByLabel('Plot Canvas').hover();
+    // Ensure pause control is visible since the global time conductor is in real time mode
+    await expect(page.getByTitle('Pause incoming real-time data')).toBeVisible();
+  });
 });
diff --git a/src/api/time/IndependentTimeContext.js b/src/api/time/IndependentTimeContext.js
index 9f9edbcc4d..148bf52adf 100644
--- a/src/api/time/IndependentTimeContext.js
+++ b/src/api/time/IndependentTimeContext.js
@@ -359,6 +359,18 @@ class IndependentTimeContext extends TimeContext {
     }
   }
 
+  /**
+   * @returns {boolean}
+   * @override
+   */
+  isFixed() {
+    if (this.upstreamTimeContext) {
+      return this.upstreamTimeContext.isFixed(...arguments);
+    } else {
+      return super.isFixed(...arguments);
+    }
+  }
+
   /**
    * @returns {number}
    * @override
@@ -400,7 +412,7 @@ class IndependentTimeContext extends TimeContext {
   }
 
   /**
-   * Reset the time context to the global time context
+   * Reset the time context from the global time context
    */
   resetContext() {
     if (this.upstreamTimeContext) {
@@ -428,6 +440,10 @@ class IndependentTimeContext extends TimeContext {
     // Emit bounds so that views that are changing context get the upstream bounds
     this.emit('bounds', this.getBounds());
     this.emit(TIME_CONTEXT_EVENTS.boundsChanged, this.getBounds());
+    // Also emit the mode in case it's different from previous time context
+    if (this.getMode()) {
+      this.emit(TIME_CONTEXT_EVENTS.modeChanged, this.#copy(this.getMode()));
+    }
   }
 
   /**
@@ -502,6 +518,10 @@ class IndependentTimeContext extends TimeContext {
       // Emit bounds so that views that are changing context get the upstream bounds
       this.emit('bounds', this.getBounds());
       this.emit(TIME_CONTEXT_EVENTS.boundsChanged, this.getBounds());
+      // Also emit the mode in case it's different from the global time context
+      if (this.getMode()) {
+        this.emit(TIME_CONTEXT_EVENTS.modeChanged, this.#copy(this.getMode()));
+      }
       // now that the view's context is set, tell others to check theirs in case they were following this view's context.
       this.globalTimeContext.emit('refreshContext', viewKey);
     }
diff --git a/src/api/time/TimeAPI.js b/src/api/time/TimeAPI.js
index 3cc2d8b6e1..8b29a7c5ff 100644
--- a/src/api/time/TimeAPI.js
+++ b/src/api/time/TimeAPI.js
@@ -23,6 +23,7 @@
 import { FIXED_MODE_KEY, REALTIME_MODE_KEY } from '@/api/time/constants';
 import IndependentTimeContext from '@/api/time/IndependentTimeContext';
 
+import { TIME_CONTEXT_EVENTS } from './constants';
 import GlobalTimeContext from './GlobalTimeContext.js';
 
 /**
@@ -142,7 +143,7 @@ class TimeAPI extends GlobalTimeContext {
   addIndependentContext(key, value, clockKey) {
     let timeContext = this.getIndependentContext(key);
 
-    //stop following upstream time context since the view has it's own
+    //stop following upstream time context since the view has its own
     timeContext.resetContext();
 
     if (clockKey) {
@@ -152,6 +153,9 @@ class TimeAPI extends GlobalTimeContext {
       timeContext.setMode(FIXED_MODE_KEY, value);
     }
 
+    // Also emit the mode in case it's different from the previous time context
+    timeContext.emit(TIME_CONTEXT_EVENTS.modeChanged, structuredClone(timeContext.getMode()));
+
     // Notify any nested views to update, pass in the viewKey so that particular view can skip getting an upstream context
     this.emit('refreshContext', key);
 
diff --git a/src/plugins/plot/MctPlot.vue b/src/plugins/plot/MctPlot.vue
index 08e2a6f3d0..cd395974b8 100644
--- a/src/plugins/plot/MctPlot.vue
+++ b/src/plugins/plot/MctPlot.vue
@@ -539,6 +539,7 @@ export default {
       this.followTimeContext();
     },
     followTimeContext() {
+      this.updateMode();
       this.updateDisplayBounds(this.timeContext.getBounds());
       this.timeContext.on('modeChanged', this.updateMode);
       this.timeContext.on('boundsChanged', this.updateDisplayBounds);
diff --git a/src/plugins/timeConductor/independent/IndependentTimeConductor.vue b/src/plugins/timeConductor/independent/IndependentTimeConductor.vue
index 5ca91492a4..2ff26ee74e 100644
--- a/src/plugins/timeConductor/independent/IndependentTimeConductor.vue
+++ b/src/plugins/timeConductor/independent/IndependentTimeConductor.vue
@@ -243,12 +243,20 @@ export default {
       this.timeContext.off(TIME_CONTEXT_EVENTS.modeChanged, this.setTimeOptionsMode);
     },
     setTimeOptionsClock(clock) {
+      // If the user has persisted any time options, then don't override them with global settings.
+      if (this.independentTCEnabled) {
+        return;
+      }
       this.setTimeOptionsOffsets();
       this.timeOptions.clock = clock.key;
     },
     setTimeOptionsMode(mode) {
-      this.setTimeOptionsOffsets();
-      this.timeOptions.mode = mode;
+      // If the user has persisted any time options, then don't override them with global settings.
+      if (this.independentTCEnabled) {
+        this.setTimeOptionsOffsets();
+        this.timeOptions.mode = mode;
+        this.isFixed = this.timeOptions.mode === FIXED_MODE_KEY;
+      }
     },
     setTimeOptionsOffsets() {
       this.timeOptions.clockOffsets =

From 28b5d7c41c438bb393e93ef0f60d47755919ede0 Mon Sep 17 00:00:00 2001
From: Shefali Joshi <simplyrender@gmail.com>
Date: Mon, 17 Feb 2025 10:23:48 -0800
Subject: [PATCH 4/4] Time strip marcus banes line "now line" fix for right
 y-axis and when now is out of bounds (#7993)

* Account for right y-axes when calculating now line position.
Don't show the now line if it's out of bounds of the time axis

* Add test for now marker in realtime and out of bounds modes
---
 .../functional/planning/timestrip.e2e.spec.js | 83 +++++++++++++++----
 src/ui/components/TimeSystemAxis.vue          | 12 ++-
 2 files changed, 76 insertions(+), 19 deletions(-)

diff --git a/e2e/tests/functional/planning/timestrip.e2e.spec.js b/e2e/tests/functional/planning/timestrip.e2e.spec.js
index 1d82071cd1..4303f308c2 100644
--- a/e2e/tests/functional/planning/timestrip.e2e.spec.js
+++ b/e2e/tests/functional/planning/timestrip.e2e.spec.js
@@ -24,7 +24,9 @@ import {
   createDomainObjectWithDefaults,
   createPlanFromJSON,
   navigateToObjectWithFixedTimeBounds,
-  setFixedIndependentTimeConductorBounds
+  setFixedIndependentTimeConductorBounds,
+  setFixedTimeMode,
+  setTimeConductorBounds
 } from '../../../appActions.js';
 import { expect, test } from '../../../pluginFixtures.js';
 
@@ -74,21 +76,14 @@ const testPlan = {
 };
 
 test.describe('Time Strip', () => {
-  test('Create two Time Strips, add a single Plan to both, and verify they can have separate Independent Time Contexts', async ({
-    page
-  }) => {
-    test.info().annotations.push({
-      type: 'issue',
-      description: 'https://github.com/nasa/openmct/issues/5627'
-    });
-
-    // Constant locators
-    const activityBounds = page.locator('.activity-bounds');
+  let timestrip;
+  let plan;
 
+  test.beforeEach(async ({ page }) => {
     // Goto baseURL
     await page.goto('./', { waitUntil: 'domcontentloaded' });
 
-    const timestrip = await test.step('Create a Time Strip', async () => {
+    timestrip = await test.step('Create a Time Strip', async () => {
       const createdTimeStrip = await createDomainObjectWithDefaults(page, { type: 'Time Strip' });
       const objectName = await page.locator('.l-browse-bar__object-name').innerText();
       expect(objectName).toBe(createdTimeStrip.name);
@@ -96,7 +91,7 @@ test.describe('Time Strip', () => {
       return createdTimeStrip;
     });
 
-    const plan = await test.step('Create a Plan and add it to the timestrip', async () => {
+    plan = await test.step('Create a Plan and add it to the timestrip', async () => {
       const createdPlan = await createPlanFromJSON(page, {
         name: 'Test Plan',
         json: testPlan
@@ -110,6 +105,22 @@ test.describe('Time Strip', () => {
         .dragTo(page.getByLabel('Object View'));
       await page.getByLabel('Save').click();
       await page.getByRole('listitem', { name: 'Save and Finish Editing' }).click();
+
+      return createdPlan;
+    });
+  });
+  test('Create two Time Strips, add a single Plan to both, and verify they can have separate Independent Time Contexts', async ({
+    page
+  }) => {
+    test.info().annotations.push({
+      type: 'issue',
+      description: 'https://github.com/nasa/openmct/issues/5627'
+    });
+
+    // Constant locators
+    const activityBounds = page.locator('.activity-bounds');
+
+    await test.step('Set time strip to fixed timespan mode and verify activities', async () => {
       const startBound = testPlan.TEST_GROUP[0].start;
       const endBound = testPlan.TEST_GROUP[testPlan.TEST_GROUP.length - 1].end;
 
@@ -119,8 +130,6 @@ test.describe('Time Strip', () => {
       // Verify all events are displayed
       const eventCount = await page.locator('.activity-bounds').count();
       expect(eventCount).toEqual(testPlan.TEST_GROUP.length);
-
-      return createdPlan;
     });
 
     await test.step('TimeStrip can use the Independent Time Conductor', async () => {
@@ -177,4 +186,48 @@ test.describe('Time Strip', () => {
       expect(await activityBounds.count()).toEqual(1);
     });
   });
+
+  test('Time strip now line', async ({ page }) => {
+    test.info().annotations.push({
+      type: 'issue',
+      description: 'https://github.com/nasa/openmct/issues/7817'
+    });
+
+    await test.step('Is displayed in realtime mode', async () => {
+      await expect(page.getByLabel('Now Marker')).toBeVisible();
+    });
+
+    await test.step('Is hidden when out of bounds of the time axis', async () => {
+      // Switch to fixed timespan mode
+      await setFixedTimeMode(page);
+      // Get the end bounds
+      const endBounds = await page.getByLabel('End bounds').textContent();
+
+      // Add 2 minutes to end bound datetime and use it as the new end time
+      let endTimeStamp = new Date(endBounds);
+      endTimeStamp.setUTCMinutes(endTimeStamp.getUTCMinutes() + 2);
+      const endDate = endTimeStamp.toISOString().split('T')[0];
+      const milliseconds = endTimeStamp.getMilliseconds();
+      const endTime = endTimeStamp.toISOString().split('T')[1].replace(`.${milliseconds}Z`, '');
+
+      // Subtract 1 minute from the end bound and use it as the new start time
+      let startTimeStamp = new Date(endBounds);
+      startTimeStamp.setUTCMinutes(startTimeStamp.getUTCMinutes() + 1);
+      const startDate = startTimeStamp.toISOString().split('T')[0];
+      const startMilliseconds = startTimeStamp.getMilliseconds();
+      const startTime = startTimeStamp
+        .toISOString()
+        .split('T')[1]
+        .replace(`.${startMilliseconds}Z`, '');
+      // Set fixed timespan mode to the future so that "now" is out of bounds.
+      await setTimeConductorBounds(page, {
+        startDate,
+        endDate,
+        startTime,
+        endTime
+      });
+
+      await expect(page.getByLabel('Now Marker')).toBeHidden();
+    });
+  });
 });
diff --git a/src/ui/components/TimeSystemAxis.vue b/src/ui/components/TimeSystemAxis.vue
index 92014e54df..a1dc86e3e9 100644
--- a/src/ui/components/TimeSystemAxis.vue
+++ b/src/ui/components/TimeSystemAxis.vue
@@ -21,7 +21,9 @@
 -->
 <template>
   <div ref="axisHolder" class="c-timesystem-axis">
-    <div class="nowMarker" :style="nowMarkerStyle"><span class="icon-arrow-down"></span></div>
+    <div class="nowMarker" :style="nowMarkerStyle" aria-label="Now Marker">
+      <span class="icon-arrow-down"></span>
+    </div>
     <svg :width="svgWidth" :height="svgHeight">
       <g class="axis" font-size="1.3em" :transform="axisTransform"></g>
     </svg>
@@ -116,8 +118,10 @@ export default {
         this.axisTransform = `translate(${this.alignmentData.leftWidth + leftOffset}, 20)`;
 
         const rightOffset = this.alignmentData.rightWidth ? AXES_PADDING : 0;
+
+        this.leftAlignmentOffset = this.alignmentData.leftWidth + leftOffset;
         this.alignmentOffset =
-          this.alignmentData.leftWidth + leftOffset + this.alignmentData.rightWidth + rightOffset;
+          this.leftAlignmentOffset + this.alignmentData.rightWidth + rightOffset;
         this.refresh();
       },
       deep: true
@@ -175,8 +179,8 @@ export default {
         this.nowMarkerStyle.height = this.contentHeight + 'px';
         const nowTimeStamp = this.openmct.time.now();
         const now = this.xScale(nowTimeStamp);
-        this.nowMarkerStyle.left = `${now + this.alignmentOffset}px`;
-        if (now > this.width) {
+        this.nowMarkerStyle.left = `${now + this.leftAlignmentOffset}px`;
+        if (now < 0 || now > this.width) {
           nowMarker.classList.add('hidden');
         }
       }