video: Center mouse when grabbing cursor.

When releasing mouse grab (activating menu etc.) we move the mouse
cursor to a non-distracting location at the bottom-right of the
screen. But this was causing abrupt jerks in mouse movement when
re-grabbing the mouse again. Center the mouse when turning on grab so
that this doesn't happen.

This fixes #283.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/i_video.c b/src/i_video.c
index 1f375577..1add5312 100644
--- a/src/i_video.c
+++ b/src/i_video.c
@@ -925,6 +925,7 @@ static void UpdateGrab(void)
     else if (grab && !currently_grabbed)
     {
         SetShowCursor(false);
+        CenterMouse();
     }
     else if (!grab && currently_grabbed)
     {