Hi!

(cross-posted from the interest ML at Thiago Maciera's suggestion)

I'm very much into retro-computing these days - I find it much more rewarding 
to keep a well-groomed and customised OS version up-to-date with self-built 
crucial components than upgrading to the latest-and-supposedly-greatest (and 
continuously spending time figuring out how to get things to work/look the way 
I expect rather than what the latest batch of young bloods think is best).

Anyway, among the components that I have been keeping functional against newer 
dependencies is Qt 5.9 (mostly because it's the last version I can run on my 
old Mac).

Among its few annoying habits is the fact that under X11 it will lose 
"copy-to-clipboard" functionality from time to time. Usually that happens in 
all running applications at the same time, so it must be some "global" event in 
the X server. I observe it mostly under Mac OS X (yes, I figured out how to do 
an X11 build there) but it does happen occasionally on Linux, too. When this 
happens, new content can only be copied to the clipboard from unaffected 
applications; pasting continues to work.

On Linux I also use Qt 5.12 for some applications, and I noticed it appears to 
have a somewhat different implementation of the clipboard functionality and 
thought I'd try to build its XCB QPA plugin as a standalone alternative plugin 
for Qt 5.9 .

https://github.com/RJVB/QAltXcbQPA

Took me a few days but it was mostly of the "tedious but trivial" kind of 
porting effort.

The result works but still has a glitch where windows are opened at an upward 
shifted position, by approximately the titlebar height. That includes menus 
attached to the menubar (but not submenus or contextmenus). Info popups can 
also have a considerable horizontal offset (e.g. in Dolphin).

I know this is old-if-not-ancient code for many of you, but does either issue 
ring a bell?
* what's the deal with the clipboard issue? Fixing it in 5.9 would be 
preferable, of course.
* what could cause the position offset? Was something moved from a standard 
component library into the plugin that is now being applied twice, for instance?

Thanks!
René
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