only show tooltips when window in focus

0012-on.draw

@@ -25,5 +25,7 @@ on.draw = function()
 	end
 	draw_menu()
 	draw_next_frames_of_animations()
-	draw_button_tooltips(Global_state)
+	if Window_in_focus then
+		draw_button_tooltips(Global_state)
+	end
 end

0177-Window_in_focus

@@ -0,0 +1 @@
+Window_focus = true

0178-on.focus

@@ -0,0 +1,3 @@
+on.focus = function(in_focus)
+	Window_in_focus = in_focus
+end