kivy: use Clock to improve button responsiveness

gui/kivy/uix/context_menu.py

@@ -6,6 +6,7 @@ from kivy.animation import Animation
 from kivy.uix.floatlayout import FloatLayout
 from kivy.lang import Builder
 from kivy.factory import Factory
+from kivy.clock import Clock
 
 Builder.load_string('''
 <MenuItem@Button>
@@ -33,6 +34,7 @@ class MenuItem(Factory.Button):
     pass
 
 class ContextMenu(Bubble):
+
     def __init__(self, obj, action_list):
         Bubble.__init__(self)
         self.obj = obj
@@ -40,7 +42,11 @@ class ContextMenu(Bubble):
             l = MenuItem()
             l.text = k
             def func(f=v):
-                f(obj)
-                if self.parent: self.parent.hide_menu()
+                Clock.schedule_once(lambda dt: self.hide(), 0.1)
+                Clock.schedule_once(lambda dt: f(obj), 0.15)
             l.on_release = func
             self.ids.buttons.add_widget(l)
+
+    def hide(self):
+        if self.parent:
+            self.parent.hide_menu()