92a00f5221
When the pointer leaves an X11 window, and enters a Wayland native window, Xwayland has no idea about Wayland native windows and may generate the wrong crossing events to another X11 window instead. To avoid that issue, Xwayland implements its own XYToWindow() handler to compare the Wayland focused surface with the X11 window found in the window tree. Commit59ad0e6a("xwayland: Fix use after free of cursors") changed the logic in sprite_check_lost_focus() to use IsParent() to compare the windows, which works when the X11 window is reparented by the window manager, but fails in the case of an override redirect window. To fix the issue, also check whether last_xwindow is the window itself. Signed-off-by: Morose <chenlinxiang@kylinos.cn> Fixes:59ad0e6a- xwayland: Fix use after free of cursors Reviewed-by: Olivier Fourdan <ofourdan@redhat.com>
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
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