271934db9f
c67f2eac56("dix: always send focus event on grab change") made dix always sent events when it's a NotifyGrab or NotifyUngrab, even if from == to, because 'from' can just come from a previous XSetInputFocus call. However, when an application calls XGrabKeyboard several times on the same window, we are now sending spurious FocusOut+FocusIn with NotifyGrab, even if the grab does not actually change. This makes screen readers for blind people spuriously emit activity events which disturb screen reading workflow when e.g. switching between menus. This commit avoids calling DoFocusEvents in that precise case, i.e. when oldWin is a previous grab and the new grab is the same window. Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Reviewed-by: Adam Jackson <ajax@redhat.com> (cherry picked from commit364d649815)
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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