Fix #4090 (#4298)

- HTML/CSS mods to remove button holding element that was blocking clicks,
instead position buttons independently;
- Disabled style now handled better in `show-on-hover` class;
- Removed overly-specific size and positioning defs from cArrowButtonBase mixin;

src/plugins/imagery/components/ImageryView.vue

@@ -84,18 +84,18 @@
                 />
             </div>
         </div>
-        <div class="c-local-controls c-local-controls--show-on-hover c-imagery__prev-next-buttons">
-            <button class="c-nav c-nav--prev"
-                    title="Previous image"
-                    :disabled="isPrevDisabled"
-                    @click="prevImage()"
-            ></button>
-            <button class="c-nav c-nav--next"
-                    title="Next image"
-                    :disabled="isNextDisabled"
-                    @click="nextImage()"
-            ></button>
-        </div>
+
+        <button class="c-local-controls c-local-controls--show-on-hover c-imagery__prev-next-button c-nav c-nav--prev"
+                title="Previous image"
+                :disabled="isPrevDisabled"
+                @click="prevImage()"
+        ></button>
+
+        <button class="c-local-controls c-local-controls--show-on-hover c-imagery__prev-next-button c-nav c-nav--next"
+                title="Next image"
+                :disabled="isNextDisabled"
+                @click="nextImage()"
+        ></button>
 
         <div class="c-imagery__control-bar">
             <div class="c-imagery__time">

src/plugins/imagery/components/imagery-view.scss

@@ -285,17 +285,17 @@
     }
 }
 
-.c-imagery__prev-next-buttons {
-    display: flex;
-    width: 100%;
-    justify-content: space-between;
-    pointer-events: none;
+.c-imagery__prev-next-button {
+    pointer-events: all;
     position: absolute;
     top: 50%;
-    transform: translateY(-75%);
+    transform: translateY(-75%); // 75% due to transform: rotation approach to the button
 
-    .c-nav {
-        pointer-events: all;
+    &.c-nav {
+        position: absolute;
+
+        &--prev { left: 0; }
+        &--next { right: 0; }
     }
 
     .s-status-taking-snapshot & {

src/styles/_controls.scss

@@ -1006,6 +1006,9 @@ input[type="range"] {
         transition: $transIn;
         opacity: 1;
         pointer-events: inherit;
+
+        &[disabled] { opacity: $controlDisabledOpacity; }
+
     }
 }
 

src/styles/_mixins.scss

@@ -599,8 +599,6 @@
 @mixin cArrowButtonBase($colorBg: transparent, $colorFg: $colorBtnFg, $filterHov: $filterHov) {
     // Copied from branch new-tree-refactor
 
-    flex: 0 0 auto;
-    position: relative;
     background: $colorBg;
 
     &:before {