[gentoo-user] Strange behavior of "tab" key with Libreoffice Calc and Plasma

[Stefano Crocco]

Hello to everyone,
a few months ago I started noticing a very annoying behavior when pressing the 
"tab" key in Libreoffice Calc. Previously, pressing this key would move the 
cursor by one cell to the right, so that I could immediately start writing 
into the cell. Now, while the cursor is moved to the correct cell (I can see 
the black border around it), I can't write in it immediately anymore. To move 
the cursor to the next cell and be able to immediately write in it, I need to 
press the tab key twice. It seems that somehow pressing the tab key once gives 
focus to the menu bar: pressing tab once, then pressing "F" brings down the 
file menu; pressing tab, then pressing "E" displays the edit menu and so on.

I tried creating a new user, but this behavior doesn't change. Starting a new 
X session using fvwm instead of Plasma makes the tab key start working 
correctly again (but using fwvm --replace to replace the window manager from 
inside a Plasma session does not). I tried looking at the various keyboard 
shortcuts in both SystemSettings and Libreoffice Calc hoping to find some hints, 
but I didn't find anything suspicious. 

Has anyone experienced this behavior? I tried looking for a bug report on 
bugs.gentoo.org but I found none. I also tried google but again without 
results.

Thanks in advance

Stefano