Shows or hides the OSK via top bar button. It works with X, not with wayland. Wayland has it's own technique: swipe the keyboard up from the bottom display edge. Source code: https://github.com/Bradan/Gnome-On-Screen-Keyboard-Button
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Hmm, Please do not change UI nor connect signal in init function. I gonna approve this time, I hope you change this issue in next version
Thank you for your review. I've changed that in the new version. Even the settings object is now created inside the enable() routine. I've thought, that you might mean only changes to existing UI, because the "hello world" example (the one created by the gnome-shell-extension-tool) does it like that. But it makes sense to do it only in enable(), since you might want to have extensions installed which are disabled. And they shouldn't influence the resources then.