Drag space option is supposed to add some space to drag window on top of tabs. Currently on Linux it does the following: - If density is set to compact, it makes the blue line of the active tab just a little bit thicker, probably one pixel thicker - If density is set to normal or touch, instead of having that line thicker, it moves it one pixel lower and therefore create a one pixel thick line between tab border and blue line. In every case, no drag space appear.
Tested on Archlinux running Gnome 3.28.
Summary: On Linux, enabling drag space give a result very different of what it should → On Linux, enabling drag space mess with the blue line of the active tab
With Arch Linux and KDE Plasma, the behaviour is again somewhat different, - With density set to compact, the drag space is never gone, and enabling "drag space" makes the "active tab indicator line" thicker (same as reporter's) - With density set to normal, if "drag space" is disabled, there's actually always a drag space above tabs; if "drag space" is enabled, after un-maximising and maximising the window, the drag space is gone - With density set to touch, the drag space never shows up I actually don't want the drag space and currently the only way for me to achieve this is to enable normal density and drag space, then manually un-maximise and maximise the window after every start.
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