https://bugs.kde.org/show_bug.cgi?id=429403
Bug ID: 429403
Summary: Changing shortcut for "Move to Trash" breaks Delete
key in text fields/editors
Product: plasma-integration
Version: 5.20.3
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: vovams...@gmail.com
Target Milestone: ---
SUMMARY
Changing key combination for action "Move to Trash" in System Settings app
causes Delete key to not work in text fields and text editors in many Qt apps.
After changing the key combination Delete key does nothing, but the
newly-assigned key works as Delete (i.e. deletes character in front of cursor).
STEPS TO REPRODUCE
1. Open System Settings application and go to Workspace > Shortcuts > Shortcuts
> Common actions > File
2. Find and expand "Move to Trash" action
3. Uncheck "Del" under "Default shortcut"
4. Click "Add custom shortcut" and press F12 key
5. Click "Apply"
OBSERVED RESULT
Immediately after clicking "Apply" Delete key stops working in the "Search..."
text field at the top of the System Settings window and F12 works instead of
it. After logging out and logging in the issue appears in other applications as
well (tested in Kickoff, KRunner, Dolphin).
EXPECTED RESULT
Changing key combination for "Move to Trash" should not affect which key is
used to delete a character in front of cursor in text fields.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE neon 5.20 User Edition (neon-user-20201119-0945.iso)
KDE Plasma Version: 5.20.3
KDE Frameworks Version: 5.75.0
Qt Version: 5.15.1
I initially found this issue in my openSUSE Tumbleweed system and later
reproduced it in a VM running KDE neon.
ADDITIONAL INFORMATION
I think that the problem is in KdePlatformTheme::keyBindings() . In the
following line it returns KStandardShortcut::MoveToTrash shortcut for
QKeySequence::Delete:
https://github.com/KDE/plasma-integration/blob/00fc43a2b71a421395e10b0cee8e67a09e398fe9/src/platformtheme/kdeplatformtheme.cpp#L262
The description of QKeySequence::Delete in Qt documentation is not very
specific, but Qt itself uses it in implementation of text fields to determine
which key should delete character in front of cursor. For example, here:
https://github.com/qt/qtbase/blob/e4961b35deb202525d4711dbb14f8c2bb0bf5c26/src/widgets/widgets/qwidgettextcontrol.cpp#L1325
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