When switching tabs in Dolphin with Ctrl+Tab the focus shifts away from the list of folders to the tab row. I think the focus should stay in the list of folders so one directly can navigate among the folders in the new tab with e.g letter keys. Now, one has to press Shift+Tab three times in order to get the focus in the list of folders in the new tab after switching to it with Ctrl+Tab or Alt+underlined letter.
I see you're using Debian stable, which has older versions of Plasma and Dolphin. I can't reproduce this in Kubuntu 17.0.4, which has Plasma 5.9.4 and Dolphin 16.12.3 which are likely much newer than what you've got. Debian 9 is about to come out, and it will include newer versions of this software. Would you mind seeing if the issue reproduces at that time?
Thanks for the information, Nate. Can't I update Plasma and Dolphin in Debian 8?
Generally no. Debian Stable's model is to lock packages and programs at known stable versions, with upgrades coming alongside new major releases of Debian itself. Lucky for you, Debian 9 is just around the corner. If you want to stick with Debian 8, you'll need to backport newer versions from Debian Testing or Sid, or else build them from source.
OK, thanks again. I shall see if the problem is still there when I get the opportunity to use Debian 9.
Yep, this was fixed a while ago. *** This bug has been marked as a duplicate of bug 338892 ***