Force refresh preedit upon activation in zwp_input_method_v2

[wengxt]

certain compositor may not send done. As this the behavior that kwin
implemented in v3, it should be generally safe to update current preedit
on focus in.

Close #1689

Summary by CodeRabbit

• Bug Fixes
  • Fixed an issue where composing text could fail to refresh when an input context gains focus.
  • Improved synchronization between the active input context and the composing text shown on screen.
  • Preedit updates are now delivered when needed, including when the composing text remains empty, helping keep the displayed state consistent.
  • These changes help prevent stale composing text and ensure input methods stay in sync as focus changes.

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• src/frontend/waylandim/waylandimserverv2.cpp

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📝 Walkthrough

Walkthrough

The InputContext API now supports forced preedit updates. The Wayland done() handler requests one when the context has real focus.

Changes

Wayland preedit refresh

Layer / File(s)	Summary
Add forced preedit updates src/lib/fcitx/inputcontext.h, src/lib/fcitx/inputcontext.cpp	InputContext adds updatePreedit(bool forceUpdate). The existing no-argument method passes false, preserving the empty-preedit suppression behavior.
Refresh preedit after focus src/frontend/waylandim/waylandimserverv2.cpp	When the done() handler has real focus and a delegated input context, it calls updatePreedit(true) to force a preedit refresh.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to a8986

The focused preedit refresh has no established merge-blocking issue in the inspected paths. No actionable merge risk remains beyond normal checks.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	For #1689, the done() handler checks realFocus() and forces updatePreedit(true) through the existing preedit path. The overload bypasses empty-preedit suppression. The handler does this on every…	Track whether a commit was sent for the current serial, and skip the forced preedit update when that serial already has a commit.
Docstring Coverage	⚠️ Warning	Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: force a preedit refresh upon activation in zwp_input_method_v2.
Out of Scope Changes check	✅ Passed	The done() handler and InputContext::updatePreedit(bool) changes support #1689. The overload allows the focused context to publish unchanged or empty preedit state through the existing update path…

Full details: Linked Issues check

Explanation

For #1689, the done() handler checks realFocus() and forces updatePreedit(true) through the existing preedit path. The overload bypasses empty-preedit suppression. The handler does this on every focused done() and does not check whether a commit was already sent for that serial, as the issue proposes.

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Actionable comments posted: 1

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Inline comments:
In `@src/frontend/waylandim/waylandimserverv2.cpp`:
- Around line 245-249: Update updatePreeditDelegate() to ignore queued preedit
events when their source input context is no longer delegated: return when the
context lacks realFocus() or differs from delegatedInputContext(). Ensure both
the update and commit paths are protected from inactive-context events.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 1bf723cd-20fc-45fe-be08-08ac7ed15a8e

📥 Commits

Reviewing files that changed from the base of the PR and between b5c2b9f and 5129c82.

📒 Files selected for processing (3)

• src/frontend/waylandim/waylandimserverv2.cpp
• src/lib/fcitx/inputcontext.cpp
• src/lib/fcitx/inputcontext.h

Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review.