Discard press event for ctrl+shift+release open_url mapping as it can causes issues when delivered to the terminal program

kitty/window.py

@@ -829,6 +829,9 @@ class Window:
     def mouse_click_url(self) -> None:
         click_mouse_url(self.os_window_id, self.tab_id, self.id)
 
+    def mouse_discard_event(self) -> None:
+        pass
+
     def mouse_click_url_or_select(self) -> None:
         if not self.screen.has_selection():
             self.mouse_click_url()