OK, I've opened bug #1461823 for this new issue.
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https://bugs.launchpad.net/bugs/1461221
Title:
undecorated onboard doesn't comply with compiz effects
To manage notifications about
Yes, current Onboard hides and shows the keyboard window wherever
possible, instead of minimizing/restoring it. IIRC it's been like this
since we switched to GTK-3 in 2012 and more out of necessity than by
design. Gnome-3/GTK-3 were trying to get rid of minimizing back then and
the required APIs
@marmuta thank you for the info. It appears to be gtk3 client side decoration
handicap. I can live with it.
I met another decoration problem, when I enable show window decoration and
set transparency to 80 while inactive, then when I move mouse pointer on window
decoration which has minimize,
