Spurious focus for client under mouse cursor about herbstluftwm

[t-wissmann]

This is a bug about key grabbing and not about the focus change. Create a key binding

herbstclient keybind Alt-x true

• Create an xterm, but focus something else (another client or an empty frame).
• Place the mouse cursor over it
• Pressing the keybinding makes the cursor flicker.

[ypnos]

This also happens when switching away to another tag.

[ypnos]

Probably related to this problem and also #33:

Have two frames, one of them empty, the other with one or several clients. Put mouse cursor over one of the clients. Open a client in the previously empty frame without moving the mouse. The new client gets focus. Close new client.

Expected: Focus stays in the previously empty frame which is empty again.
Observed: Visual feedback (frame/window borders) indicates that the empty frame is focused. However keyboard input is directed to the client under the mouse cursor. The client in question also got a focus in event, but no focus out event.

[t-wissmann]

It seems that this is an inherent issue in X, that is also present in other window managers, e.g. fluxbox:

• Open xterm twice in fluxbox
• Focus one xterm, and place the cursor over the other xterm
• Press Alt-Space (default keybinding for the window menu)
• Notice how the cursor flickers

(If you don't want to boot into a fluxbox session, run Xephyr +extension kb -resizeable :13 from a terminal and DISPLAY=:13 fluxbox from another terminal, and you'll have a fluxbox session in a Xephyr/Xnest window).

[t-wissmann]

I fear that hlwm can't fix this because it's inherently related to X.