1. generate enough output in Konsole that scrolling is possible 2. scroll up 3. press the 'super' (Windows) key 4. click (before scrolling again) The click mysteriously causes the window to scroll to the bottom of history. This is fairly old behaviour; may be related to: https://bugs.kde.org/show_bug.cgi?id=236733 I trigger this a lot (I use Super+F1 etc. to switch desktops), and find it annoying when scrolling up the history, switching, coming back and trying to select text.
This might be fixed with commit 54ecd560b8d76121256a0bd653999fb8d4acb363 Please test version 16.12 when it's out in December.
Close, it was fixed by eea5ecfc5ed93515afaae5b9b938154eeaaf0ba8 (I had the same problem with switching desktops and then clicking in konsole). 54ecd560b8d76121256a0bd653999fb8d4acb363 fixed that it wasn't scrolling down often enough after the first patch. :-)