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Type: Bug
Resolution: Unresolved
Priority: P2: Important
Fix Version/s: 5.15.5
Affects Version/s: 5.6.2, 5.8.0 RC, 5.15.0, 5.15.1, 5.15.2, 6.0.0, 6.0.1
Component/s: GUI: Complex Input methods
Labels:
- CandidateForScale
- android_visual_bug

Platform/s:

Android

On Android, the platform input context does not implement update()
(http://code.qt.io/cgit/qt/qtbase.git/tree/src/plugins/platforms/android/qandroidinputcontext.cpp?h=5.8.0#n645).
Instead, it relies on connecting to the widget's cursorPositionChanged() signal
(http://code.qt.io/cgit/qt/qtbase.git/tree/src/plugins/platforms/android/qandroidinputcontext.cpp?h=5.8.0#n684).

As a result, custom widgets which properly interact with the input method via update() but do not provide cursorPositionChanged() suffer in the following way after changing the position:

The current word does not become the current preedit string.
The predictive text does not reflect the current context.
The next letter entered by the user is composed with the (invisible) preedit string from the previous context and inserted as the new preedit string at the cursor position.

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qtbug58013.zip
2 kB
22 Feb '21 12:00
qt_6_1_0_event_vs_qt_5_15_2.mp4
4.34 MB
17 Feb '21 14:10

relates to

QTBUG-56042 QInputMethod visibleChanged signal fired incorrectly on Android

Reported

QTBUG-95669 Clicking enter on some text fields it might freeze UI

Closed

QTBUG-88701 QLineEdit::textEdited called with empty QString

Closed

resulted in

QTBUG-93414 Qt Quick application stuck in a cursor update loop

Closed

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For Gerrit Dashboard: QTBUG-58013
#	Subject	Branch	Project	Status	CR	V
338916,14	[Android] Remove signal and slot mechanism to listen states in editor's	dev	qt/qtbase	Status: MERGED	+2	0
339044,9	[Android] Remove signal and slot mechanism to listen states in editors	tqtc/lts-5.15	qt/tqtc-qtbase	Status: MERGED	+2	0
376543,2	Revert "[Android] Remove signal and slot mechanism to listen states in editor's"	dev	qt/qtbase	Status: MERGED	+2	0
376597,2	Revert "[Android] Remove signal and slot mechanism to listen states in editor's"	6.2	qt/qtbase	Status: MERGED	+2	0
376598,2	Revert "[Android] Remove signal and slot mechanism to listen states in editor's"	6.2.1	qt/qtbase	Status: MERGED	+2	0
376601,3	Revert "[Android] Remove signal and slot mechanism to listen states in editor's"	tqtc/lts-5.15	qt/tqtc-qtbase	Status: MERGED	+2	0
376850,2	Revert "[Android] Remove signal and slot mechanism to listen states in editor's"	tqtc/lts-5.15.7	qt/tqtc-qtbase	Status: MERGED	+2	0