Commit 032ec8fd authored by Adrien Plazas's avatar Adrien Plazas

GTK+: Update the titlebar related sections

Replace the Header Bar and Separators section by the Title Bar section
and the Selection Mode section.

These explain how to handle these UI elements in a simpler and better
way, taking recent improvements to GTK+ and libhandy into accounts.
parent 7ec0283c
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