Normally, if you double click on a function in the outline toolview, the corresponding function is highlighted the the open editor file. However, if you split the view on this file (left/right or top/bottom), I would expect that the double click acts on the version of the file in the split view that currently has the focus (i.e. either the left or right version). In fact, the outline toolview just works on the view on the file that has been created by splitting the view, no matter if you bring the focus back to the original file. Only closing the split view of that file makes the outline work again.
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!