effects/overview: Forward unhandled keys to search field

After user edits the name of a desktop, the search field is no longer
focused. If the user starts typing text, one could expect that it will
be forwarded to the search field without requiring a click.

This change forwards unhandled key events to the search field to ensure
that searching is intuitive.

src/effects/overview/qml/ScreenView.qml

@@ -29,6 +29,9 @@ FocusScope {
 
     Keys.onEscapePressed: effect.deactivate();
 
+    Keys.priority: Keys.AfterItem
+    Keys.forwardTo: searchField
+
     Repeater {
         model: KWinComponents.ClientFilterModel {
             activity: KWinComponents.Workspace.currentActivity
@@ -136,6 +139,7 @@ FocusScope {
                     clearButtonShown: true
                     Keys.priority: Keys.AfterItem
                     Keys.forwardTo: heap
+                    onTextEdited: forceActiveFocus();
                 }
             }