qml: update visual QML debug helper feature (DebugRect.qml) for qt6

src/lib_app/qml/DebugRect.qml

@@ -22,7 +22,13 @@ Item {
   visible: {
     // If the environment variable configured the ACCENT color to match our sentinel,
     // then every instance of DebugRect will become visible:
-    Material.accent == sentinelColor
+    var detectionInQt5 = (Material.accent == sentinelColor)
+    // See the `runscene` script in this repo. Qt6 requires a new approach:
+    var detectionInQt6 = ('-myqmldebug' == Qt.application.arguments.find(
+                            element => element == '-myqmldebug'))
+
+    // Either detection mechanism can enable the DebugRect(s):
+    detectionInQt5 || detectionInQt6
   }
 
   // Limiting ourselves to this palette helps us unambiguously grep for color names

src/lib_app/qml/DebugRectangle.qml

@@ -15,7 +15,17 @@ Rectangle {
   // or under qmlscene), then just do this before launch:
   // export QT_QUICK_CONTROLS_MATERIAL_ACCENT="#0B610B"
   readonly property color sentinelColor: "#0B610B"
-  visible: Material.accent == sentinelColor
+  visible: {
+    // If the environment variable configured the ACCENT color to match our sentinel,
+    // then every instance of DebugRect will become visible:
+    var detectionInQt5 = (Material.accent == sentinelColor)
+    // See the `runscene` script in this repo. Qt6 requires a new approach:
+    var detectionInQt6 = ('-myqmldebug' == Qt.application.arguments.find(
+                            element => element == '-myqmldebug'))
+
+    // Either detection mechanism can enable the DebugRect(s):
+    detectionInQt5 || detectionInQt6
+  }
 
   anchors.fill: toFill
   z: 200

src/lib_app/qml/main.qml

@@ -160,8 +160,8 @@ ApplicationWindow {
         text: "SPACEBAR (on logo): rotates logo"
 
         DebugRect {
-          // To make the DebugRect show up in the GUI, change your environment:
-          //     export QT_QUICK_CONTROLS_MATERIAL_ACCENT="#0B610B"
+          // This shows a "visual debug" border, but when only when you
+          // enable the feature.
           // (See comments in DebugRect.qml for more information.)
           color: red
         }

src/lib_app/qml/runscene

@@ -7,10 +7,18 @@ source "${DIR}/../../../tools/ci/rootdirhelper.bash"
 
 source $CUR_GUICODE_ROOT/path_to_qmake.bash # path to qmake is also path to qmlscene
 
-# In order to cause our DebugRectangle instances to become visible, uncomment:
+# In order to cause our DebugRectangle instances to become visible, do the following
+# in your terminal before you call `runscene`:
 # export QT_QUICK_CONTROLS_MATERIAL_ACCENT="#0B610B"
 
+RUNSCENE_EXTRA_CONF=()
+if [[ ${QT_QUICK_CONTROLS_MATERIAL_ACCENT-} == "#0B610B" ]]; then
+  # The 'material accent' hack only worked in Qt5.
+  # Here is our adaptation for Qt6:
+  RUNSCENE_EXTRA_CONF=('-myqmldebug')
+fi
+
 # In order that all the qml 'import' statements for our supporting libraries can
 # successfully load, you must feed some additional paths to qmlscene like so:
 
-qmlscene -I ../../libstyles/imports/ "$@"
+qmlscene -I ../../libstyles/imports/ ${RUNSCENE_EXTRA_CONF[@]} "$@"

src/lib_app/qml/runstyledscene

@@ -7,10 +7,18 @@ source "${DIR}/../../../tools/ci/rootdirhelper.bash"
 
 source $CUR_GUICODE_ROOT/path_to_qmake.bash # path to qmake is also path to qmlscene
 
-# In order to cause our DebugRectangle instances to become visible, uncomment:
+# In order to cause our DebugRectangle instances to become visible, do the following
+# in your terminal before you call `runscene`:
 # export QT_QUICK_CONTROLS_MATERIAL_ACCENT="#0B610B"
 
+RUNSCENE_EXTRA_CONF=()
+if [[ ${QT_QUICK_CONTROLS_MATERIAL_ACCENT-} == "#0B610B" ]]; then
+  # The 'material accent' hack only worked in Qt5.
+  # Here is our adaptation for Qt6:
+  RUNSCENE_EXTRA_CONF=('-myqmldebug')
+fi
+
 # In order that all the qml 'import' statements for our supporting libraries can
 # successfully load, you must feed some additional paths to qmlscene like so:
 
-qmlscene -I ../../libstyles/imports/ -style fusion "$@"
+qmlscene -I ../../libstyles/imports/ ${RUNSCENE_EXTRA_CONF[@]} -style fusion "$@"