From 7bba5a5fc5db6c339d3df4169aabe424f68fe092 Mon Sep 17 00:00:00 2001
From: Eirik Aavitsland <eirik.aavitsland@qt.io>
Date: Fri, 9 Apr 2021 08:50:15 +0200
Subject: [PATCH] Fix read-only pseudo-state in QPlainTextEdit stylesheet

Was implemented for the other text edit widgets, but not for
QPlainTextEdit.

Fixes: QTBUG-92490
Change-Id: Idd2a1b5c743fc030d3f2d4dd24e98f806b58f4d9
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit f3a042c5ab998c0d283017f3569bb72c392580b7)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/widgets/styles/qstylesheetstyle.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/widgets/styles/qstylesheetstyle.cpp b/src/widgets/styles/qstylesheetstyle.cpp
index b9c0aaa1998..7c75be2fc73 100644
--- a/src/widgets/styles/qstylesheetstyle.cpp
+++ b/src/widgets/styles/qstylesheetstyle.cpp
@@ -60,6 +60,7 @@
 #if QT_CONFIG(textedit)
 #include <qtextedit.h>
 #endif
+#include <qplaintextedit.h>
 #include <private/qwindowsstyle_p.h>
 #if QT_CONFIG(combobox)
 #include <qcombobox.h>
@@ -2106,6 +2107,9 @@ QRenderRule QStyleSheetStyle::renderRule(const QObject *obj, const QStyleOption
 
         }
 #endif
+        else if (const QPlainTextEdit *edit = qobject_cast<const QPlainTextEdit *>(obj)) {
+            extraClass |= (edit->isReadOnly() ? PseudoClass_ReadOnly : PseudoClass_Editable);
+        }
 #if QT_CONFIG(textedit)
         else if (const QTextEdit *edit = qobject_cast<const QTextEdit *>(obj)) {
             extraClass |= (edit->isReadOnly() ? PseudoClass_ReadOnly : PseudoClass_Editable);
@@ -2541,7 +2545,9 @@ static quint64 extendedPseudoClass(const QWidget *w)
         pc |= (edit->isReadOnly() ? PseudoClass_ReadOnly : PseudoClass_Editable);
     } else
 #endif
-    { } // required for the above ifdef'ery to work
+    if (const QPlainTextEdit *edit = qobject_cast<const QPlainTextEdit *>(w)) {
+        pc |= (edit->isReadOnly() ? PseudoClass_ReadOnly : PseudoClass_Editable);
+    }
     return pc;
 }