This patch does the following things:
- An option "Merge menu and title bar" (this is hopefully more understandable
than calling it "Client-side decoration" or again "header bar") is added in
Preferences > Image Windows. This option triggers the restart warning.
Moreover when checked a small warning message will tell that in some cases, it
may not work (there are feedbacks of people having 2 title bars when using GTK
applications using CSD).
- For the reason evoked above (sometimes 2 title bars) and also because the CSD
concept seem really to divide people a lot (some love this as much as others
hate this), this new option "custom-title-bar" on GimpGuiConfig is FALSE by
default.
- When the option is checked, the image windows will use a GTK header bar
containing the menu, the window title (image name and information) as well as
the usual minimize/maximize/close buttons per your OS conventions.
- Since the header bar is set to be hidden when maximizing, if you checked "Show
menubar" for the "Default Appearance in Fullscreen Mode" in Preferences >
Image Windows > Appearance, the menu will be moved to its "old style"
position, i.e. above the canvas. This makes the menu possibly visible (if
relevant option is checked) even in fullscreen mode.
- I tweaked the Default theme to show the header bar with minimal height,
because I find GTK default theme's headerbar height unreasonably high
(especially if the point of the header bar is to save screen space). I am
unsure if this was the right move though, because maybe the default theme
should not do such choices (maybe this should go in the Compact theme?).
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