mintUpdate.py: Show window as busy immediately upon starting an

update operation.

There was a delay between starting an install and blocking the ui
to prevent further (undefined) interaction that could allow
multiple dialogs to appear.

Remove the idle delay from set_window_busy(), so it applies
immediately when called, but keep it on an idle callback in
finish_install(), which is not on the main thread.

Fixes linuxmint/mint22.2-beta#34.

Author: mtwebster

usr/lib/linuxmint/mintUpdate/mintUpdate.py

@@ -730,7 +730,6 @@ def show_window(self, time=Gtk.get_current_event_time()):
         self.ui_window.present_with_time(time)
         self.hidden = False
 
-    @_idle
     def set_window_busy(self, busy):
         if self.ui_window.get_window() is None:
             return
@@ -2533,14 +2532,17 @@ def finish_install(self, refresh_needed):
 
         self.uninhibit_pm()
         self.cache_monitor.resume(False)
-        self.set_window_busy(False)
+
+        GLib.idle_add(self.set_window_busy, False)
         if refresh_needed:
             self.refresh(False)
 
     def install(self, widget):
         if self.dpkg_locked():
             self.show_dpkg_lock_msg(self.ui_window)
         else:
+            self.set_window_busy(True)
+
             # Find list of packages to install
             install_needed = False
             self.packages = []
@@ -2589,7 +2591,6 @@ def install(self, widget):
                 iter = model.iter_next(iter)
             self.settings.set_int("install-last-run", int(time.time()))
             if install_needed:
-                self.set_window_busy(True)
                 self.cache_monitor.pause()
                 self.inhibit_pm("Installing updates")
                 self.logger.write("Install requested by user")