SUMMARY Okular from kde applications 19.12 and earlier scrolls approximately one text line when using up/down keys. Since 20.04 when pressing up/down key okular jumps over several text lines. When reading text this jump confuse eyes from current reading position. It is very inconvenient. STEPS TO REPRODUCE Compare scroll lines/pixels count using up/down keys in okular from kde applications 19.12 and 20.04 EXPECTED RESULT Scroll count using up/down keys should be as it was in okular from 19.12 SOFTWARE/OS VERSIONS Linux/KDE Plasma: ArchLinux KDE Plasma Version: 5.19.3 KDE Frameworks Version: 5.71 Qt Version: 5.15
This is intentional now that there's a smooth animated scrolling effect, which will be re-enabled in Okular 1.11.2 (AKA from kde applications 20.08.2). It should be nicer now and hopefully it's not annoying anymore.
If I make the window small, arrow keys scroll almost half of the page. In item based views, a scroll step is usually 3 lines, but not more than one line less than fits on screen. Currently PageView scrolls by 100 device independent pixels. How about scrolling 5 Em, but not more than 25% of the viewport height?
That seems reasonable, but shouldn't be be 3em to match the default number of lines to scroll? I fact we should just make sure that the arrow keys scroll exactly as much as one "tick" of a mouse's scroll wheel.