BT: Fixes Crash when deleting a QProgressBar which has been styled with QMotifStyle

Same fix as in e9a7e43031d7c1ee712e43be682c4e2c183759c4 but with motif

Reported by https://bugs.kde.org/show_bug.cgi?id=193911

Task-number: 255138
Reviewed-by: jbache
(cherry picked from commit cbe3119db5380c41d44d4e936c7da4889c02f147)

3 files changed, 25 insertions, 3 deletions

diff --git a/dist/changes-4.5.2 b/dist/changes-4.5.2
index 6772405..a54d8ba 100644
--- a/dist/changes-4.5.2
+++ b/dist/changes-4.5.2
@@ -67,6 +67,9 @@ Third party components
     * [253339] Don't draw arrows on toolbuttons that have a menu and text only.
     * [252301] Ensure that small and mini spin boxes are drawn correctly.
 
+- QMotifStyle
+    * Fix crash when changing style and destroying progressbar.
+
 - QFontDialog
     * [252000] Ensure that QFontDialog::getFont() works on Mac OS X.
 
diff --git a/src/gui/styles/qmotifstyle.cpp b/src/gui/styles/qmotifstyle.cpp
index 30fb160..eabc595 100644
--- a/src/gui/styles/qmotifstyle.cpp
+++ b/src/gui/styles/qmotifstyle.cpp
@@ -298,8 +298,11 @@ void QMotifStyle::unpolish(QWidget* widget)
 {
     QCommonStyle::unpolish(widget);
 #ifndef QT_NO_PROGRESSBAR
-    if (qobject_cast<QProgressBar *>(widget))
+    if (qobject_cast<QProgressBar *>(widget)) {
+        Q_D(QMotifStyle);
         widget->removeEventFilter(this);
+        d->bars.removeAll(static_cast<QProgressBar*>(widget));
+     }
 #endif
 }
 
diff --git a/tests/auto/qprogressbar/tst_qprogressbar.cpp b/tests/auto/qprogressbar/tst_qprogressbar.cpp
index 78489d9..c46950a 100644
--- a/tests/auto/qprogressbar/tst_qprogressbar.cpp
+++ b/tests/auto/qprogressbar/tst_qprogressbar.cpp
@@ -63,6 +63,7 @@ private slots:
     void setValueRepaint();
     void sizeHint();
 
+    void task245201_testChangeStyleAndDelete_data();
     void task245201_testChangeStyleAndDelete();
 };
 
@@ -224,15 +225,30 @@ void tst_QProgressBar::sizeHint()
     QCOMPARE(barSize.height(), size.height());
 }
 
+void tst_QProgressBar::task245201_testChangeStyleAndDelete_data()
+{
+    QTest::addColumn<QString>("style1_str");
+    QTest::addColumn<QString>("style2_str");
+
+    QTest::newRow("plastique-windows") << QString::fromLatin1("plastique") << QString::fromLatin1("windows");
+    QTest::newRow("mlotif-windows") << QString::fromLatin1("motif") << QString::fromLatin1("windows");
+    QTest::newRow("cleanlooks-cde") << QString::fromLatin1("cleanlooks") << QString::fromLatin1("cde");
+    QTest::newRow("gtk-plastique") << QString::fromLatin1("gtk") << QString::fromLatin1("plastique");
+}
+
 void tst_QProgressBar::task245201_testChangeStyleAndDelete()
 {
+    QFETCH(QString, style1_str);
+    QFETCH(QString, style2_str);
+
     QProgressBar *bar = new QProgressBar;
 
-    QStyle *style = QStyleFactory::create("plastique");
+    QStyle *style = QStyleFactory::create(style1_str);
     bar->setStyle(style);
     bar->show();
-    QStyle *style2 = QStyleFactory::create("windows");
+    QStyle *style2 = QStyleFactory::create(style2_str);
     bar->setStyle(style2);
+    QTest::qWait(10);
 
     delete bar;
     QTest::qWait(100); //should not crash