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Whenever we want to re-use widgets from the former child SplitterOrView,
we must make sure that this doesn't delete it later on.

Showed up as a double horizontal line at the bottom that only
disappeared after entering and exiting the FakeVim mode.

delete-other-windows

Insert a separator line, remove the tooltip-style background.

namespace

small tweaks to the open editors view, and an attempt to implement a down state for the close button.
Why isn't pressedIndex in QAbstractItemView accessible, or at least a state flag in the delegate to
indicate that this item is pressed down?

with mouse-over. The change makes the list behave more like tabs.

Task:     240811

Task:     240811

Task:     240811

Task:     Reported on irc
RevBy:    mae

This makes restoring sessions faster, but switching to restored documents for the first time
a bit slower.

Small bugfix for column to jump to.

editor

RevBy:    - dt

Task:     243877
Details:  itemClicked() instead of itemActivated()

RevBy: eike

view has been specified. This allows to use the open editors view
as tabbar replacement also in split mode.

Done with mae.