Synfig: Inconsistent Synfig UI on GNOME desktop

[Keyikedalube]

Synfig version & platform:
Building from master branch
Debian sid

Issue description:
On GNOME desktop Synfig UI and native UI looks quite inconsistent. Below is an example screenshot taken for About program's window:


Notice how the sizes of header buttons About | Credits | Licence for Synfig Studio doesn't match with the GNOME Terminal one
BTW the second screenshot is how all GTK apps look normally on GNOME desktop

Same is observed for file open dialog box:

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[rodolforg]

Reason is here:

App::apply_gtk_settings() (in synfig-studio/src/gui/app.cpp https://github.com/synfig/synfig/blob/87e7ffa55e48d43323df3751576a685cc19010fb/synfig-studio/src/gui/app.cpp#L2317)

[Keyikedalube]

You mean the custom CSS that fixed the below issue?
https://github.com/synfig/synfig/blob/87e7ffa55e48d43323df3751576a685cc19010fb/synfig-studio/src/gui/app.cpp#L2337

[rodolforg]

yes.
but I commented out this part of code and... voilà.
I didn't see those toolbars and rulers that thick.
Anyway, maybe those toolbars should have specific CSS styles, and Synfig should not change the general ones

[Keyikedalube]

I'm working on this issue :)