Allow maximising panel conditionally.

Add code that maximises panel length when maximised windows are present on the same screen.

containment/package/contents/config/main.xml

@@ -190,6 +190,10 @@
     <entry name="offset" type="Double">
       <default>0</default>
     </entry>
+    <entry name="maximizeWhenMaximized" type="Bool">
+      <default>false</default>
+      <label>Maximize panel in presense of maximized windows</label>
+    </entry>
     <entry name="dragActiveWindowEnabled" type="Bool">
       <default>false</default>
       <label>Drag and maximize/restore active window from empty areas</label>

containment/package/contents/ui/main.qml

@@ -203,6 +203,7 @@ Item {
     readonly property int minAppletLengthInConfigure: 16
     readonly property int maxJustifySplitterSize: 64
 
+    property bool maximizeWhenMaximized: plasmoid.configuration.maximizeWhenMaximized;
     property real minLengthPerCentage: plasmoid.configuration.minLength
     property real maxLengthPerCentage: hideLengthScreenGaps ? 100 : plasmoid.configuration.maxLength
 
@@ -219,10 +220,12 @@ Item {
     }
 
     property int maxLength: {
+        const maximize = behaveAsPlasmaPanel
+          || (maximizeWhenMaximized && latteView.windowsTracker.currentScreen.existsWindowMaximized);
         if (root.isHorizontal) {
-            return behaveAsPlasmaPanel ? width : width * (maxLengthPerCentage/100)
+            return maximize ? width : width * (maxLengthPerCentage/100)
         } else {
-            return behaveAsPlasmaPanel ? height : height * (maxLengthPerCentage/100)
+            return maximize ? height : height * (maxLengthPerCentage/100)
         }
     }
 

shell/package/contents/configuration/pages/AppearanceConfig.qml

@@ -563,6 +563,28 @@ PlasmaComponents.Page {
                     }
                 }
             }
+            LatteComponents.SubHeader {
+                visible: dialog.advancedLevel
+                text: i18nc("@label dynamic length configuration", "Dynamic Length Adjustments")
+                enabled: true
+            }
+
+            LatteComponents.CheckBoxesColumn {
+                enabled: dialog.advancedLevel;
+                LatteComponents.CheckBox {
+                    id: maximizeWhenMaximizedChk
+                    Layout.maximumWidth: dialog.optionsWidth
+                    text: i18nc("@label", "Maximize panel length in presence of maximized windows")
+                    tooltip: i18n("Change panel length to maximum screen size when there is a maximized window present on the screen")
+                    enabled: showBackground.checked
+                    visible: dialog.advancedLevel
+                    value: plasmoid.configuration.maximizeWhenMaximized
+
+                    onClicked: {
+                        plasmoid.configuration.maximizeWhenMaximized = !plasmoid.configuration.maximizeWhenMaximized;
+                    }
+                }
+            }
         }
         //! END: Length