RDP big-monitor fix + HUD: EGFX frame budget for 5160x2160 (#611)

Jump-from-iPad showed color bars/cut sides at the big external monitor.
Headless freerdp UAT proved the server clean at 5160x2160 on all codecs
and mid-session resize; mitigation raises the EGFX compressed-frame
budget via systemd drop-in, applied by 12-fix-rdp-bigres.sh (idempotent,
restart-guarded). Human UAT pending.

Detail: https://projects.knownelement.com/issues/611#note-3341

12-fix-rdp-bigres.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+# 12-fix-rdp-bigres.sh — xrdp EGFX big-resolution fix (Redmine #611)
+#
+# Symptom: Jump Desktop from iPad -> big external monitor (5160x2160)
+# showed color bars / cut sides. Root cause candidate: default EGFX
+# compressed-frame budget truncates large frames at this width.
+# freerdp UAT at 5160x2160 (all codecs + mid-session resize) is clean;
+# this mitigation raises the budget for the Jump client path.
+#
+# Idempotent: run as root on ultix-streaming.
+
+set -euo pipefail
+
+DROPIN=/etc/systemd/system/xrdp.service.d/bigres.conf
+
+mkdir -p "$(dirname "$DROPIN")"
+cat > "$DROPIN" <<'EOF'
+[Service]
+Environment=XRDP_GFX_MAX_COMPRESSED_BYTES=33554432
+Environment=XRDP_GFX_FRAMES_IN_FLIGHT=2
+EOF
+
+systemctl daemon-reload
+# bounce only when nobody is connected: check for active RDP sessions first
+ACTIVE=$(pgrep -c -f 'Xorg.*xrdp/xorg.conf' || true)
+if [ "${ACTIVE:-0}" -gt 0 ]; then
+  echo "Active RDP X sessions: $ACTIVE — NOT restarting; apply at next bounce with:"
+  echo "  systemctl restart xrdp-sesman xrdp"
+else
+  systemctl restart xrdp-sesman xrdp
+  sleep 2
+  systemctl is-active xrdp xrdp-sesman
+fi
+
+grep -q XRDP_GFX_MAX_COMPRESSED_BYTES "$DROPIN" && echo "drop-in present: $DROPIN"