From 70f064f270fa5765f0f00b8eccb45fb7eb68cd9a Mon Sep 17 00:00:00 2001
From: Liang Qi <liang.qi@qt.io>
Date: Wed, 19 Apr 2023 13:23:10 +0200
Subject: [PATCH] QWidgetTextControl: ignore invalid input method event

to avoid update the text document.

Fixes: QTBUG-112953
Pick-to: 6.5 6.2 5.15
Change-Id: Ib72de57133314e4eb38a15758b8318d901196d75
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
Reviewed-by: Artem Sokolovskii <artem.sokolovskii@qt.io>
---
 src/widgets/widgets/qwidgettextcontrol.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/widgets/widgets/qwidgettextcontrol.cpp b/src/widgets/widgets/qwidgettextcontrol.cpp
index a4679402dc..1204b48b50 100644
--- a/src/widgets/widgets/qwidgettextcontrol.cpp
+++ b/src/widgets/widgets/qwidgettextcontrol.cpp
@@ -2032,6 +2032,11 @@ void QWidgetTextControlPrivate::inputMethodEvent(QInputMethodEvent *e)
             || e->preeditString() != cursor.block().layout()->preeditAreaText()
             || e->replacementLength() > 0;
 
+    if (!isGettingInput && e->attributes().isEmpty()) {
+        e->ignore();
+        return;
+    }
+
     int oldCursorPos = cursor.position();
 
     cursor.beginEditBlock();