Hiding the dialog instead of destroying it doesn't seem to cause as much chaos (Fixes #397)

lutris/gui/dialogs.py

@@ -32,6 +32,10 @@ class GtkBuilderDialog(GObject.Object):
     def on_close(self, *args):
         self.dialog.destroy()
 
+    def on_response(self, widget, response):
+        if response == Gtk.ResponseType.DELETE_EVENT:
+            self.dialog.hide()
+
 
 class AboutDialog(GtkBuilderDialog):
     glade_file = 'about-dialog.ui'

share/lutris/ui/about-dialog.ui

@@ -38,6 +38,7 @@ Xodetaetl &lt;dev@xod.me&gt;</property>
     <property name="wrap_license">True</property>
     <property name="license_type">gpl-3-0</property>
     <signal name="close" handler="on_close" swapped="no"/>
+    <signal name="response" handler="on_response" swapped="no"/>
     <child internal-child="vbox">
       <object class="GtkBox" id="aboutdialog-vbox1">
         <property name="can_focus">False</property>