[Qemu-devel] [Bug 1703795] [PATCH] sdl2: fix mouse grab

[Gerd Hoffmann <1703795@bugs.launchpad.net>]

When qemu mouse mode changes from relative to absolute
we must turn off sdl relative mouse mode too.

Fixes: https://bugs.launchpad.net/qemu/+bug/1703795
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 ui/sdl2.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ui/sdl2.c b/ui/sdl2.c
index 812c315891..858e04d7c0 100644
--- a/ui/sdl2.c
+++ b/ui/sdl2.c
@@ -249,6 +249,7 @@ static void sdl_mouse_mode_change(Notifier *notify, void *data)
     if (qemu_input_is_absolute()) {
         if (!absolute_enabled) {
             absolute_enabled = 1;
+            SDL_SetRelativeMouseMode(SDL_FALSE);
             absolute_mouse_grab(&sdl2_console[0]);
         }
     } else if (absolute_enabled) {
-- 
2.9.3

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https://bugs.launchpad.net/bugs/1703795

Title:
  Unable to release mouse in SDL2 mode

Status in QEMU:
  New

Bug description:
  Starting with commit 8f4ea9cd0b770dbe496d9d24f0ef8813fdbfe0d0 "sdl:
  prefer sdl2 over sdl1", I can no longer release mouse pointer grab
  unless I use --with-sdlabi=1.2 configure option.

  This easily reproduces in e.g. guest Kubuntu, when I let it start Xorg
  and then click into the QEMU window. After this the mouse is trapped
  and no matter how I combine Ctrl+Alt and motion of the cursor, the
  pointer never goes out from the window. When at the border, QEMU
  window switches from "Press Ctrl+Alt to exit grab" to "QEMU", i.e. it
  thinks that it has released the grab. But it hasn't really, so I have
  to go to VT1 and do "pkill qemu" from there to get my pointer back.

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