Fix Xorg hang in Elder Scrolls Online Installer (306130) #186
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sync_window_position() calls XReconfigureWMWindow() to update the window with a new position or size. However, it unconditionally assumes that the size has changed, and sets the mask and calls XReconfigureWMWindow() anyway. In addition, it will toggle the fullscreen state on KWin, to work around the fact that _NET_WM_FULLSCREEN windows can't be moved there. Instead, only set the mask based on which properties have actually changed, and don't do anything (except updating shaped windows, if required) if the resulting mask is 0. This fixes an issue with the Elder Scrolls Online installer, which can cause Xorg (and even Xwayland) to hang due to ending up in a Reconfigure loop. Signed-off-by: David Gow <david@ingeniumdigital.com>
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The Elder Scrolls Online Installer (which runs the first time the game is played), is something of a stress-test for Wine's X11 backend.
In particular, it resizes, moves, and maximizes (for fullscreen) several windows with logos, before toggling fullscreen off and using an alpha-blended "launcher" UI. Interestingly the "fullscreen" windows end up 1442×902 on my 1440×900 display, which possibly contributes to the issues (maybe WM_BORDER?).
When doing this, it can end up in a loop whereby X11Drv_WindowPosChanged
callssync_window_position``, which triggers a reconfigure, etc. This endless stream of reconfigures causes Xorg to effectively hang, making interaction with the computer impossible. This happens for me with a KWin/nVidia setup, on both real Xorg and via Xwayland.Using KWin may be part of the issue, as
sync_window_positiontoggles _NET_WM_FULLSCREEN when KWin is used, as its not possible to move/resize fullscreen windows under KWin.By making
sync_window_position()only reconfigure things which have actually changed, the issue goes away, and the installer works fine.(I'm not an expert on this code, so it's possible I've broken something else. I can put it behind a SteamGameId check if that'd help.)