Fix crash on enabling mirror display (#415)

* Fix Scale set by adding modes before set calling

* Set monitor before scale

* Fix overlay update when enabling mirrored display

* Revert some changes

* Fix indentation

Co-authored-by: Ryo Nakano <ryonakaknock3@gmail.com>

---------

Co-authored-by: Ryo Nakano <ryonakaknock3@gmail.com>

Author: leonardo-lemos

src/Objects/MonitorManager.vala

@@ -297,8 +297,8 @@ public class Display.MonitorManager : GLib.Object {
     public void enable_clone_mode () {
         var clone_virtual_monitor = new Display.VirtualMonitor ();
         clone_virtual_monitor.primary = true;
-        clone_virtual_monitor.scale = Utils.get_min_compatible_scale (monitors);
         clone_virtual_monitor.monitors.add_all (monitors);
+        clone_virtual_monitor.scale = Utils.get_min_compatible_scale (monitors);
         var modes = clone_virtual_monitor.get_available_modes ();
         /*
          * Two choices here:
@@ -364,6 +364,9 @@ public class Display.MonitorManager : GLib.Object {
             var single_virtual_monitor = new Display.VirtualMonitor ();
             var preferred_mode = monitor.preferred_mode;
             var current_mode = monitor.current_mode;
+
+            single_virtual_monitor.monitors.add (monitor);
+
             if (global_scale_required) {
                 single_virtual_monitor.scale = max_scale;
                 if (max_scale in preferred_mode.supported_scales) {
@@ -388,7 +391,6 @@ public class Display.MonitorManager : GLib.Object {
                 single_virtual_monitor.scale = preferred_mode.preferred_scale;
             }
 
-            single_virtual_monitor.monitors.add (monitor);
             new_virtual_monitors.add (single_virtual_monitor);
         }
 

src/Widgets/DisplaysOverlay.vala

@@ -186,10 +186,12 @@ public class Display.DisplaysOverlay : Gtk.Box {
 
     public void rescan_displays () {
         scanning = true;
-        foreach (unowned var widget in display_widgets) {
-            display_widgets.remove (widget);
-            widget.destroy ();
-        }
+
+        display_widgets.@foreach ((display_widget) => {
+            overlay.remove_overlay (display_widget);
+            display_widget.destroy ();
+            display_widgets.remove (display_widget);
+        });
 
         active_displays = 0;
         foreach (var virtual_monitor in monitor_manager.virtual_monitors) {