don't save settings on error in source editor

app.lua

@@ -53,7 +53,8 @@ function handle_error(err)
     App.undo_initialize()
     App.run_tests_and_initialize()
   else
-    if App.disable_tests then App.disable_tests() end
+    -- abort without running love.quit handler
+    Disable_all_quit_handlers = true
     love.event.quit()
   end
 end

main.lua

@@ -331,6 +331,7 @@ function App.wheelmoved(dx,dy)
 end
 
 function love.quit()
+  if Disable_all_quit_handlers then return end
   if current_app_is_warning() then return end
   if Current_app == 'run' then
     local source_settings = Settings.source

source.lua

@@ -271,7 +271,6 @@ function source.settings()
   if Settings == nil then Settings = {} end
   if Settings.source == nil then Settings.source = {} end
   Settings.source.x, Settings.source.y, Settings.source.displayindex = App.screen.position()
-  App.screen.width, App.screen.height = App.screen.size()
   File_navigation.cursors[Editor_state.filename] = {cursor1=Editor_state.cursor1, screen_top1=Editor_state.screen_top1}
   return {
     x=Settings.source.x, y=Settings.source.y, displayindex=Settings.source.displayindex,