how to get rid of the annoying blue line in new plasma/breeze

have just updated to snapshot 20180122 (on KDE/plasma) and there is now a rather hideous and annoying thin blue line running horizontally across the top of every window. Could anyone say what component/config is generating this and how one might go about editing or getting the old version back?
[ps the old light bulb was better, so much for progress]

You mean just below the window title bar?

Could anyone say what component/config is generating this

The “Breeze” window decoration.

and how one might go about editing or getting the old version back?

Disable it in the settings, or choose a different window decoration.
systemsettings5->Application Style->Window Decorations

[ps the old light bulb was better, so much for progress]

Well, tastes differ, I suppose…

That’s the new Leap 15 branding, as opposed to the previous Leap 42 branding.

> You mean just below the window title bar?
yes

thankyou, after half an hour of searching i realised in the look and feel section each theme had a small edit button (im on hiDPI screen)

problem solved and have learnt something!

Click on the Configure button for the breeze decoration (located in the preview), you’ll find the option “Draw separator between Title Bar and Window” on the first tab (“General”).

Btw, this blue line is not at all new.
But until now the decoration decided by some heuristics whether to hide it, now this has been changed into an explicit config option.
https://cgit.kde.org/breeze.git/commit/kdecoration?h=Plasma/5.12&id=d6ba3352fe6c4207e639c996a00278c8438f4f06

so it is the ‘decorations’ i.e. not breeze theme itself?

And what do you mean with “theme” in this context?

The “Breeze” window decoration is written in C++, and is part of the breeze source code, same as the widget style (which is also written in C++).

the ones offered in the kde library are not to my taste, can i install the previous breeze decorations?

Probably, I don’t think there have been incompatible changed in kwin. But you’d need to compile the source yourself.

apologies, i editing my response after my realisation of the control in the decorations preview, if you look above your last response i managed to find the control, thanks so much.

PS, see also https://phabricator.kde.org/D8362

Before that it wasn’t possible at all to disable it, you were just “lucky” if you didn’t see it… :wink: