Activate click overlays on startup/monitors-changed

We separate resetting the tiling overlay and activating/deactivating the monitor
click overlay.

stackoverlay.js

@@ -72,7 +72,7 @@ class ClickOverlay {
 
         this.enterSignal = enterMonitor.connect(
             'enter-event', () => {
-                this.reset();
+                this.deactivate();
                 let space = Tiling.spaces.monitors.get(this.monitor);
                 space.workspace.activate(global.get_current_time());
                 return Clutter.EVENT_STOP;
@@ -86,10 +86,13 @@ class ClickOverlay {
         this.enterMonitor.set_size(monitor.width, monitor.height);
     }
 
+    deactivate() {
+        this.enterMonitor.set_size(0, 0);
+    }
+
     reset() {
         this.left.setTarget(null);
         this.right.setTarget(null);
-        this.enterMonitor.set_size(0, 0);
     }
 
     destroy() {

tiling.js

@@ -340,6 +340,7 @@ class Spaces extends Map {
         for (let monitor of Main.layoutManager.monitors) {
             let overlay = new ClickOverlay(monitor);
             monitor.clickOverlay = overlay;
+            overlay.activate();
             this.clickOverlays.push(overlay);
         }
 
@@ -568,6 +569,8 @@ function enable() {
                 let toSpace = spaces.spaceOf(to);
                 spaces.monitors.set(toSpace.monitor, toSpace);
 
+                toSpace.monitor.clickOverlay.deactivate();
+
                 let display = Gdk.Display.get_default();
                 let deviceManager = display.get_device_manager();
                 let pointer = deviceManager.get_client_pointer();