1 files changed, 30 insertions, 3 deletions
diff --git a/src/gui/widgets/qlinecontrol_p.h b/src/gui/widgets/qlinecontrol_p.h
index 44bd7214be..d4c4154b3d 100644
--- a/src/gui/widgets/qlinecontrol_p.h
+++ b/src/gui/widgets/qlinecontrol_p.h
@@ -65,6 +65,7 @@
 #include "QtCore/qpoint.h"
 #include "QtGui/qcompleter.h"
 #include "QtGui/qaccessible.h"
+#include "QtCore/qthread.h"
 
 #include "qplatformdefs.h"
 
@@ -90,6 +91,10 @@ public:
 #ifdef QT_GUI_PASSWORD_ECHO_DELAY
         , m_passwordEchoTimer(0)
 #endif
+#if defined(Q_WS_MAC)
+        , m_threadChecks(false)
+        , m_textLayoutThread(0)
+ #endif
     {
         init(txt);
     }
@@ -332,11 +337,27 @@ public:
 
     bool processEvent(QEvent *ev);
 
-    QTextLayout *textLayout()
+    QTextLayout *textLayout() const
     {
+#if defined(Q_WS_MAC)
+        if (m_threadChecks && QThread::currentThread() != m_textLayoutThread)
+            redoTextLayout();
+#endif
         return &m_textLayout;
     }
 
+#if defined(Q_WS_MAC)
+    void setThreadChecks(bool threadChecks)
+    {
+        m_threadChecks = threadChecks;
+    }
+
+    bool threadChecks() const
+    {
+        return m_threadChecks;
+    }
+#endif
+
 private:
     void init(const QString &txt);
     void removeSelectedText();
@@ -433,8 +454,8 @@ private:
     QString stripString(const QString &str) const;
     int findInMask(int pos, bool forward, bool findSeparator, QChar searchChar = QChar()) const;
 
-    // complex text layout
-    QTextLayout m_textLayout;
+    // complex text layout (must be mutable so it can be reshaped at will)
+    mutable QTextLayout m_textLayout;
 
     bool m_passwordEchoEditing;
     QChar m_passwordCharacter;
@@ -451,6 +472,12 @@ private:
 #endif
     }
 
+    int redoTextLayout() const;
+#if defined(Q_WS_MAC)
+    bool m_threadChecks;
+    mutable QThread *m_textLayoutThread;
+#endif
+
 Q_SIGNALS:
     void cursorPositionChanged(int, int);
     void selectionChanged();