[kmail2] [Bug 434196] New: No touchscreen support in kmail

[Daniel Tang]

https://bugs.kde.org/show_bug.cgi?id=434196

            Bug ID: 434196
           Summary: No touchscreen support in kmail
           Product: kmail2
           Version: unspecified
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: danielzgtg.opensource at gmail.com
  Target Milestone: ---

SUMMARY

I can't scroll the email list and folder tree with a touchscreen.

STEPS TO REPRODUCE

1. Try to touch and scroll the list of emails with your finger
2. Try to touch and scroll the folder tree with your finger

OBSERVED RESULT

The touch is treated as if it was a mouse. This is not what one usually wants,
and this makes it hard to scroll.

EXPECTED RESULT

The touch should scroll just like in Dolphin. The rest of the gestures from
https://invent.kde.org/system/dolphin/-/commit/d7b33b76a18b14e9f286e4d8326b00910b9ea02a
should also be supported.

ANALYSIS

I tried to add a QScroller to two classes with QTreeView in Akonadi Widgets.
The folder tree started scrolling to touch, but the drag and drop was still
active. This didn't work with the list of emails did not scroll at all.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Ubuntu 21.04
KDE Plasma Version: 5.21.2
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
Kmail: kmail2 5.16.3 (20.12.3)

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