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Bug 3489 - X11: keypress events are delivered twice with certain IMEs
Summary: X11: keypress events are delivered twice with certain IMEs
Status: RESOLVED FIXED
Alias: None
Product: SDL
Classification: Unclassified
Component: events (show other bugs)
Version: 2.0.5
Hardware: x86_64 Linux
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-11-12 18:06 UTC by felix
Modified: 2016-11-15 09:19 UTC (History)
0 users

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Description felix 2016-11-12 18:06:04 UTC 
Whenever I launch an SDL2 program, every keyboard event is delivered to it twice.

It turns out the culprit is a workaround for IMEs in the X11 video driver. I use UIM; when it sits there idle ('direct' input method), every KeyPress/KeyRelease X11 event is delivered twice: the first time is supposed to be discarded after processing by XFilterEvent and the other is not. SDL, however, specifically delivers events that XFilterEvent indicates should be ignored.

I can work around this problem by emptying the XMODIFIERS variable in the environment of SDL2 apps, disabling the IME.
Comment 1 Sam Lantinga 2016-11-13 08:11:09 UTC 
I think this was fixed in changeset 10570.

Can you verify it's fixed by the latest SDL snapshot?
http://www.libsdl.org/tmp/SDL-2.0.zip

Thanks!
Comment 2 felix 2016-11-13 10:23:07 UTC 
Yes, it seems that does it. Thank you.
Comment 3 Sam Lantinga 2016-11-15 09:19:56 UTC 
Great, thanks!