[aurorae] Fix MaximizeRestore Button of Aurorae Themes

Seems like porting to new infrastructure was incomplete. The
MaximizeRestore button consists of two buttons on top of each other with
an own mouse area in each and both always visible. This means the restore
button was stealing the mouse events of the maximize button breaking
maximization.

The solution is to have an additional MouseArea which controls the whole
button making the two button types just visualization.

clients/aurorae/src/qml/AuroraeMaximizeButton.qml

@@ -21,11 +21,17 @@ Item {
     id: button
     width: auroraeTheme.buttonWidthMaximizeRestore * auroraeTheme.buttonSizeFactor
     height: auroraeTheme.buttonHeight * auroraeTheme.buttonSizeFactor
+    property bool hovered: false
+    property bool pressed: false
+    property bool toggled: false
     AuroraeButton {
         id: maximizeButton
         anchors.fill: parent
         buttonType: DecorationOptions.DecorationButtonMaximizeRestore
         opacity: (!decoration.maximized || auroraeTheme.restoreButtonPath == "") ? 1 : 0
+        hovered: button.hovered
+        pressed: button.pressed
+        toggled: button.toggled
         Behavior on opacity {
             NumberAnimation {
                 duration: auroraeTheme.animationTime
@@ -37,10 +43,27 @@ Item {
         anchors.fill: parent
         buttonType: DecorationOptions.DecorationButtonMaximizeRestore + 100
         opacity: (decoration.maximized && auroraeTheme.restoreButtonPath != "") ? 1 : 0
+        hovered: button.hovered
+        pressed: button.pressed
+        toggled: button.toggled
         Behavior on opacity {
             NumberAnimation {
                 duration: auroraeTheme.animationTime
             }
         }
     }
+    MouseArea {
+        anchors.fill: parent
+        acceptedButtons: {
+            return Qt.LeftButton | Qt.RightButton | Qt.MiddleButton;
+        }
+        hoverEnabled: true
+        onEntered: button.hovered = true
+        onExited: button.hovered = false
+        onPressed: button.pressed = true
+        onReleased: button.pressed = false
+        onClicked: {
+            decoration.maximize(mouse.button);
+        }
+    }
 }