Description (updated)

There is no action assigned on middle mouse button right now
and this patch adds an option to Settings->Configure->Taskbar which enables 
closing a tab like in browsers/different editors using wheel click.

Option is disabled by default.

Testing

Tested manually

Diffs

src/MainWindow.h (b297883)
src/MainWindow.cpp (0ba82f0)
src/ViewContainer.h (d5bdf73)
src/ViewContainer.cpp (63c187d)
src/ViewManager.h (f039a27)
src/ViewManager.cpp (8a902d0)
src/settings/TabBarSettings.ui (b9ace21)
src/settings/konsole.kcfg (b850d9a)

View Diff