[dolphin] [Bug 426716] New: Touchpad-scrolling on breadcrumbs address bar is very jumpy

[Frank Steinmetzger]

https://bugs.kde.org/show_bug.cgi?id=426716

            Bug ID: 426716
           Summary: Touchpad-scrolling on breadcrumbs address bar is very
                    jumpy
           Product: dolphin
           Version: 20.08.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: bars: location
          Assignee: dolphin-bugs-null at kde.org
          Reporter: Warp_7 at gmx.de
                CC: kfm-devel at kde.org
  Target Milestone: ---

Dear devs,

for a long time now I have a problem with the breadcrumb address bar. On the
laptop I mostly use two-finger-scrolling on the touchpad. It works nicely in
other applications, such as Okular or even Dolphin’s file view – albeit the
latter is a little too fast.

When I try scrolling on a directory in the breadcrumbs address bar, either
nothing happens at all (presumably because I move the fingers too slowly) or it
jumps several directories at once. It is practically impossible to browse
through directories in a controlled manner. My most often use case is to view
several picture directories in succession in Gwenview.

When I decrease the scrolling distance in the Touchpad Settings to slow down
scrolling and be less jumpy in general, then I can’t get the directory to
change at all.

It is absolutely no problem when using a wheel mouse. The wheel produces
discrete scroll events with one rotation index of the wheel, and I can move
from one dir to the next very precisely.

STEPS TO REPRODUCE
1. Use a laptop with a touchpad
2. Open a file view with an address bar set to breadcrumbs style (e.g. Dolphin
or Gwenview)
3. Open a directory that has sibling directories and move the mouse cursor over
its entry in the address bar
4. Try scrolling with the touchpad

OBSERVED RESULT
Either nothing happens or it scrolls through too fast.

EXPECTED RESULT
It should be more easy to scroll through one directory at a time. Perhaps the
trigger is based on some scroll event, that is only produced above a certain
scrolling speed, but then in too large numbers. Maybe it should be triggered by
scrolling distance instead. I must assume that touchpad scrolling works
differently to mouse wheel scrolling. Otherwise the observed smooth movement in
Okular wouldn’t be possible.

Thank you.

SOFTWARE/OS VERSIONS
KDE Frameworks 5.74.0
Qt 5.15.1
KDE Plasma 5.19.5

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