From b6ac1b4bbf46221ee33fcca8f49c2c67c6cb6ed8 Mon Sep 17 00:00:00 2001
From: Jeremy Tan <jtanx@outlook.com>
Date: Sat, 17 Sep 2016 20:46:30 +0800
Subject: [PATCH] GDK W32: Ignore autorepeated key presses on modifier keys

The X11 backend does not send autorepeated messages for modifier keys,
and doing so prevents motion compression from working.

https://bugzilla.gnome.org/show_bug.cgi?id=771568
---
 gdk/win32/gdkevents-win32.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/gdk/win32/gdkevents-win32.c b/gdk/win32/gdkevents-win32.c
index 220771b152..363193ab26 100644
--- a/gdk/win32/gdkevents-win32.c
+++ b/gdk/win32/gdkevents-win32.c
@@ -2281,6 +2281,14 @@ gdk_event_translate (MSG  *msg,
 	  in_ime_composition)
 	break;
 
+      /* Ignore autorepeats on modifiers */
+      if (msg->message == WM_KEYDOWN &&
+          (msg->wParam == VK_MENU ||
+           msg->wParam == VK_CONTROL ||
+           msg->wParam == VK_SHIFT) &&
+           ((HIWORD(msg->lParam) & KF_REPEAT) >= 1))
+        break;
+
       if (keyboard_grab &&
           !propagate (&window, msg,
 		      keyboard_grab->window,