Skype loses focus when changing keyboard layout with ALT+SHIFT

Solution 1:

I guess the way you have set-up your ALT+SHIFT shortcut is via gnome-tweak-tool?

If that's the case - I have the same issue with slack, after some digging found out that there is another way to change the keyboard layout w/o using gnome-tweak-tool which wont cause this side effect of losing the focus.

The solution is to use gsettings as explained here

gsettings set org.gnome.desktop.wm.keybindings switch-input-source "['<Shift>Alt_L']"
gsettings set org.gnome.desktop.wm.keybindings switch-input-source-backward "['<Alt>Shift_L']"

UPDATE: As mentioned in the comments, make sure to also uncheck the ALT+SHIFT shortcut from gnome-tweak-tool.

Solution 2:

That was an odd issue. It looks like pressing only Alt is a Skype specific shortcut. Alt+Shift, OTOH, is an XKB shortcut. One way to avoid that Skype is affected is to make sure you press Shift first and then press Alt while still holding the Shift key.

Or, of course, using the default Super+Space is another way to avoid the conflict.