https://bugs.kde.org/show_bug.cgi?id=492225
Bug ID: 492225
Summary: text-input-v3: kwin does not send empty preedit when
backspace is pressed after composing one character.
Classification: Plasma
Product: kwin
Version: 6.1.4
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: input
Assignee: kwin-bugs-n...@kde.org
Reporter: o...@igalia.com
Target Milestone: ---
SUMMARY
text-input-v3: kwin does not send empty or null preedit when backspace is
pressed after a single character is composed.
STEPS TO REPRODUCE
1. With WAYLAND_DEBUG=1 and filtering for text-input-v3 logs, open any app that
uses text-input-v3 and focus an input field
2. Switch language to enable IME (e.g. japanese anthy)
3. Enter a character, e.g. 'a'
4. Press backspace
OBSERVED RESULT
3. The preedit string is received:
```
zwp_text_input_v3#44.preedit_string("あ", 3, 3)
zwp_text_input_v3#44.done(31)
```
4. Only `done` is received:
```
zwp_text_input_v3#44.done(31)
```
EXPECTED RESULT
3. Should be same as seen
4. Another `preedit` and `done` should be received:
```
zwp_text_input_v3#44.preedit_string("", 0, 0)
zwp_text_input_v3#44.done(31)
```
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.1.4
ADDITIONAL INFORMATION
When backspace is pressed after two characters are entered, it correctly sends
the new preedit with the single character.
In text-input-v1 it does send an empty preedit string when backspace is
entered.
```
zwp_text_input_v1#44.preedit_string(0, "", "")
```
Also, gnome sends a nil preedit string in text-input-v3 as well:
```
zwp_text_input_v3#40.preedit_string(nil, 0, 0)
zwp_text_input_v3#40.done(514)
```
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