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* doc/lispref/frames.texi (Input Focus): Clarify for XInput 2 support.

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Po Lu 2022-12-01 19:15:28 +08:00 • committed by Eli Zaretskii
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doc/lispref/frames.texi
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@ -2854,10 +2854,18 @@ The plural ``frames'' in the previous paragraph is deliberate: while
Emacs itself has only one selected frame, Emacs can have frames on
many different terminals (recall that a connection to a window system
counts as a terminal), and each terminal has its own idea of which
frame has input focus. When you set the input focus to a frame, you
set the focus for that frame's terminal, but frames on other terminals
frame has input focus. Under the X Window System, where user input is
organized into individual ``seats'' of input, each seat in turn can
have its own specific input focus. When you set the input focus to a
frame, you set the focus for that frame's terminal on the last seat
which interacted with Emacs, but frames on other terminals and seats
may still remain focused.
If the input focus is set before any user interaction has occurred on
the specified terminal, then the X server picks a random seat
(normally the one with the lowest number) and sets the input focus
there.
Lisp programs can switch frames temporarily by calling the function
@code{select-frame}. This does not alter the window system's concept
of focus; rather, it escapes from the window manager's control until