[Fix] Don't show instant popup when clicking on back/forward button.

CHANGELOG

@@ -1,3 +1,7 @@
+Version 1.4.1
+    * not yet released
+    * fixed instantly showing popup when clicking on back/forward button
+
 Version 1.4.0
     * released 11 March 2013
     * highlighting host in address in locationbar

src/lib/tools/toolbutton.cpp

@@ -92,12 +92,19 @@ void ToolButton::setMultiIcon(const QPixmap &image)
 
 void ToolButton::mousePressEvent(QMouseEvent* e)
 {
-    if (e->button() != Qt::MiddleButton && menu()) {
+    if (e->button() == Qt::LeftButton && menu() && popupMode() == QToolButton::InstantPopup) {
         setDown(true);
         showMenu();
         return;
     }
 
+    if (e->button() == Qt::RightButton && menu()) {
+        setDown(true);
+        showMenu();
+        return;
+    }
+
+
     if (e->button() == Qt::MiddleButton) {
         setDown(true);
     }