On 2016-12-26 02:24:30 +0100, Vincent Lefevre wrote:
> I'd say that problem 1 occurs at around 1 over 10. AFAIK, it had never
> occurred before the upgrade.

Actually, I've now found that what matters was not the upgrade,
but the fact that I had been using this config (a bit recent)
only with a real mouse, and the problems started to appear only
when I used the touchpad of my laptop.

After doing more tests with xev, I've noticed that the time delta
between the ButtonPress event and the ButtonRelease event was in
general much lower with the touchpad: about 120 units with the
mouse button, but sometimes less than 10 units with the button
of the touchpad.

Then I tried to reproduce the problem with the touchpad but letting
the touchpad button pressed a bit longer, and I couldn't.

So, it seems to be a timing issue in Fvwm. Perhaps it "forgets" the
ButtonRelease event, since the behavior when the bug occurs is similar
to what happens when I SCM-press the button but don't release it.

-- 
Vincent Lefèvre <[email protected]> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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