Tamás,
As you look at adjusting the UI grouping of the 'Help' and 'Extension'
buttons, a currently annoying aspect of the Nested GtkBox's  used is that
each level of the box gets picked up and announced by screen reader AT. 
Although not set to focus, each GtkBox seems to get picked up as empty
"White space", at least on the NVDA (2103.2) screen reader.
It doesn't seem as annoying with the GtkGrid layout of the tool bars,
buttons and menus for panels in the Sidebar. There does seem to be UI
customization of the buttons there.  Is that maybe a possibility for an
adjustment of the SC UI?
Stuart 
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