Simplify tile dismissal

We want floating tiles to be activatable, but also dismiss the effect by
clicking on the whitespace.

The current solution doesn't work as a floating tile that is in turn
split will pull focus from the children meaning those tiles can't be deleted.

Rather than special casing and z-manipulation we can simplify everything
by moving tile dismissal to the root of the effect and appropariately
propagating the event.

BUG: 465740

src/effects/tileseditor/qml/TileDelegate.qml

@@ -17,7 +17,7 @@ Item {
 
     x: Math.round(tile.absoluteGeometryInScreen.x)
     y: Math.round(tile.absoluteGeometryInScreen.y)
-    z: (tile.layoutDirection === KWinComponents.Tile.Floating ? 1 : 0) + (focus ? 10 : 0)
+    z: focus ? 1000 : 0
     //onZChanged: print(delegate + " "+z)
     width: Math.round(tile.absoluteGeometryInScreen.width)
     height: Math.round(tile.absoluteGeometryInScreen.height)
@@ -126,12 +126,12 @@ Item {
             MouseArea {
                 anchors.fill: parent
                 hoverEnabled: true
-               // enabled: tile.layoutDirection === KWinComponents.Tile.Floating
+                propagateComposedEvents: true
                 property point lastPos
                 onClicked: {
                     delegate.focus = true;
                     if (tile.layoutDirection !== KWinComponents.Tile.Floating) {
-                        effect.deactivate(effect.animationDuration);
+                        mouse.accepted = false;
                     }
                 }
                 onPressed: {

src/effects/tileseditor/qml/main.qml

@@ -46,6 +46,11 @@ FocusScope {
         active = false;
     }
 
+    MouseArea {
+        anchors.fill: parent
+        onClicked: effect.deactivate(effect.animationDuration);
+    }
+
     Item {
         id: blurredWindows
         anchors.fill: parent