[Development] Qt/XCB applications and deadkeys and ibus (which cease working) (and sometimes the entire keyboard in Konsole)

[Allan Sandfeld Jensen]

On Montag, 12. Juni 2017 10:17:50 CEST René J. V. Bertin wrote:
> Allan Sandfeld Jensen wrote:
> > I am on Debian and found the same thing. Apt-get remove im-config solves
> > the issue. Apparently it is a buggy package that forces Qt to use ibus
> > without ensuring ibus is launched.
> 
> That's not what I saw. Ibus was always launched at login, and im-config
> seems to get some length to ensure that applications always use the "best"
> method available if the user didn't configure things to use a specific
> method. That's why newly launched Qt applications work fine after exiting
> ibus. The loss of keyboard input in Qt5 applications is a priori not a
> packaging fault but a regression in Qt itself.
> 
> > Btw. In a similar vain of packages having a negative impact on Qt. I also
> > recomment uninstalling at-spi2-core which sets the environment variable to
> > force accessibility always on which has a big negative performance impact.
> 
> Thanks for the suggestion, at least I could uninstall that one without
> taking a sh*load of other packages along with it...
> What env. variable would that be (I don't want to log off and on AGAIN just
> yet
> :))
> 
QT_LINUX_ACCESSIBILITY_ALWAYS_ON

It forces Qt to send accessibility events with new content trees everything 
something changes.

Though the real problem might be that Linux lacks a good way to enable 
accessibility interfaces at runtime. On macOS and Windows, the same 
performance impact is only enabled if you start using a system accessibility 
feature.

'Allan