The 'standard' corner widgets are part of QTabWidget not QTabBar unfortunately - which means that to get them you have to have the whole central area managed by QTabWidget.  If I remember correctly, Konsole does not use QTabWidget (it does use QTabBar though) because I wanted more control over the layout of the tabs and the margins and spacing around the main terminal - mainly to reduce them.  At the time QTabBar::documentMode() did not exist which solves some of the problems.

I also orignally had the idea that I might want to try other navigation methods than tabs (such as a vertical list of session names).

> This creates a visual inconsistency between Konsole
> and apps like Konqueror and Konversation.

This is true but only when the buttons are visible, which they are not by default because I wanted minimal visual clutter around the terminal area.

Using a regular tab bar in document mode should actually reduce the spacing further these days, e.g. the tab bar baseline is actually a pixel or two narrower then, for example (which would be another item on the list of visual inconsistencies right now).

The "baseline thing is only relevant when buttons are enabled" point is true, but then it's a pretty popular option for users to enable, and "but it's only buggy if the user uses the feature" isn't that much of an argument imho ;).

I understand the historic reasons for the difference, but whether it can be dealt with now would be worth investigating imho.

> I understand the historic reasons for the difference,
> but whether it can be dealt with now would be worth investigating imho.

Sure - I'd be happy to test a suitable patch.

Fix: Konsole now uses QTabWidget and does not rely in custom code for tabs.

Tomaz, could you please set your full name in bugzilla? Our users have a right to know who fixes bugs :)