Created attachment 179925 [details] Dragging tabs out of bounds. If you have 2 tabs or more, you can drag them beyond the left corner. This issue also takes away an useful visual indicator for reaching the first tab when dragging a tab among many others.
If it is intentional, what about limiting to a maximum of a 25% dip into the void?
I suspect this is upstream Qt based on https://bugs.kde.org/show_bug.cgi?id=411431 , which is related, but I'm not sure so marking as confirmed since I can reproduce.
We actually do want users to be able to detach tabs from a window in the future, so while this bug report is valid, I think we should rather fix that working than adapting the visual to the current incomplete state. https://bugs.kde.org/show_bug.cgi?id=411431 tracks the detaching of tabs feature request. We unfortunately don't have a common compononent in KDE currently which gives us tab-related features for free.