bug#26104: 26.0.50; In Ubuntu, having mouse over other frame cause Alt key to produce a <switch-frame> event

[martin rudalics]

> Heh, it looks like they copied the MS-Windows (mis)feature, whereby
> tapping the Alt key activates the menu bar, which would indeed require
> a focus-in event; seems like some GNU/Linux distros have joined this
> lunacy.  In the MS-Windows build, we have w32-pass-alt-to-system to
> control that.

If I'm not mistaken, on MS-Windows you can activate the menu bar of a
window via the Alt key iff that window has focus already.  I still fail
to understand how pressing the Alt key could transfer focus to another
window.

> Perhaps we should generalize w32-pass-alt-to-system instead?  Assuming
> an application can control this behavior on GNU/Linux, that is.

If Compiz can, Emacs should be able to do that too.

martin