de0031eefd
XTest requests lets the client specify a device ID, only if none is specified do we fall back to the XTEST special device. As of commitaa4074251input: Add new hook DeviceSendEventsProc for XTEST regular devices are no longer able to send XTest events because they have no sendEventsProc set. This caused issue #1574 and the crash was fixed with commite820030dextest: Check whether there is a sendEventsProc to call but we still cannot send XTest events through a specific device. Fix this by defaulting every device to the XTest send function and punting it to the DDX (i.e. Xwayland) to override the devices as necessary. Fixese820030de2Fixesaa4074251f
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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