Add app menu svg support for aurorae

This adds support for a proper app menu icon for aurorae svg
decorations. The appmenu.svg(z) file will be used for the icon if it
exists. If not, it will fallback to the window's icon, the same as
before.

BUG: 404322

src/plugins/kdecorations/aurorae/src/lib/auroraetheme.cpp

@@ -120,6 +120,7 @@ void AuroraeTheme::loadTheme(const QString &name, const KConfig &config)
     d->initButtonFrame(KeepBelowButton);
     d->initButtonFrame(ShadeButton);
     d->initButtonFrame(HelpButton);
+    d->initButtonFrame(AppMenuButton);
 
     d->themeConfig.load(config);
     Q_EMIT themeChanged();
@@ -411,6 +412,7 @@ BUTTON_PATH(keepAboveButtonPath, KeepAboveButton)
 BUTTON_PATH(keepBelowButtonPath, KeepBelowButton)
 BUTTON_PATH(shadeButtonPath, ShadeButton)
 BUTTON_PATH(helpButtonPath, HelpButton)
+BUTTON_PATH(appMenuButtonPath, AppMenuButton)
 
 #undef BUTTON_PATH
 

src/plugins/kdecorations/aurorae/src/lib/auroraetheme.h

@@ -98,6 +98,7 @@ class /*LIBAURORAE_EXPORT*/ AuroraeTheme : public QObject
     Q_PROPERTY(QString keepBelowButtonPath READ keepBelowButtonPath NOTIFY themeChanged)
     Q_PROPERTY(QString shadeButtonPath READ shadeButtonPath NOTIFY themeChanged)
     Q_PROPERTY(QString helpButtonPath READ helpButtonPath NOTIFY themeChanged)
+    Q_PROPERTY(QString appMenuButtonPath READ appMenuButtonPath NOTIFY themeChanged)
     Q_PROPERTY(QColor activeTextColor READ activeTextColor NOTIFY themeChanged)
     Q_PROPERTY(QColor inactiveTextColor READ inactiveTextColor NOTIFY themeChanged)
     Q_PROPERTY(Qt::Alignment horizontalAlignment READ alignment NOTIFY themeChanged)
@@ -156,6 +157,7 @@ public:
     QString keepBelowButtonPath() const;
     QString shadeButtonPath() const;
     QString helpButtonPath() const;
+    QString appMenuButtonPath() const;
     QColor activeTextColor() const;
     QColor inactiveTextColor() const;
     Qt::Alignment alignment() const;

src/plugins/kdecorations/aurorae/src/qml/AppMenuButton.qml

@@ -7,12 +7,23 @@ import QtQuick
 import org.kde.kirigami 2.20 as Kirigami
 import org.kde.kwin.decoration
 
-DecorationButton {
+Item {
     id: appMenuButton
-    buttonType: DecorationOptions.DecorationButtonApplicationMenu
     visible: decoration.client.hasApplicationMenu
-    Kirigami.Icon {
+    AuroraeButton {
+        id: primary
         anchors.fill: parent
-        source: decoration.client.icon
+        buttonType: DecorationOptions.DecorationButtonApplicationMenu
+        visible: auroraeTheme.appMenuButtonPath
+    }
+    DecorationButton {
+        id: fallback
+        anchors.fill: parent
+        buttonType: DecorationOptions.DecorationButtonApplicationMenu
+        visible: !auroraeTheme.appMenuButtonPath
+        Kirigami.Icon {
+            anchors.fill: parent
+            source: decoration.client.icon
+        }
     }
 }

src/plugins/kdecorations/aurorae/src/qml/AuroraeButton.qml

@@ -52,6 +52,9 @@ DecorationButton {
         case DecorationOptions.DecorationButtonQuickHelp:
             // help
             return auroraeTheme.helpButtonPath;
+        case DecorationOptions.DecorationButtonApplicationMenu:
+            // app menu
+            return auroraeTheme.appMenuButtonPath;
         case DecorationOptions.DecorationButtonMinimize:
             // minimize
             return auroraeTheme.minimizeButtonPath;