Bug 416357

SUMMARY

When using action modifiers (e.g. Shift) during drag the effects of the said modifiers are not applied immediately. Instead, modifiers are checked on drag event, causing bad user experience

STEPS TO REPRODUCE
Scenario: Moving a file.
1. Start dragging a folder.
2. Drag to target position.
3. Press shift to set action to move, do not move mouse.

OBSERVED RESULT
Mouse cursor is not updated to indicate file move.

EXPECTED RESULT
Mouse cursor is updated to indicate file move.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.14.5
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.5 (against 5.12.5)

ADDITIONAL INFORMATION
- Moving mouse slightly still holding shift and handle changes to move handle in some cases.
- Pressing modifier and starting drag sets the handle correctly. It seems the code is updated only thinking about this scenario.
- A similar behavior is present in context menu. Pressing shift converts "Move to Trash" to "Delete" immediately. This is the expected behavior during drag too.