the arrow appears on hover. the change was intentional.

The arrow doesn't appear on hover for me...

Created attachment 16468 [details]
there is no arrow

Created attachment 16470 [details]
there is an arrow

a small correction. the arrow doesn't appear if the icon (for the menu) is on a panel, which is on the left side of the screen. weird... two screenshots for the audience.

SVN commit 548428 by aseigo:

fix arrow locations on vert panels
patch by Maxilys <maxilys@tele2.fr>
BUGS:128622,128561


 M  +8 -3      panelbutton.cpp  


--- branches/KDE/3.5/kdebase/kicker/libkicker/panelbutton.cpp #548427:548428
@@ -631,7 +631,8 @@
     if (m_drawArrow && (m_highlight || active))
     {
         QStyle::PrimitiveElement e = QStyle::PE_ArrowUp;
-        QRect r(width() / 2 - 4, 0, 8, 8);
+        int arrowSize = style().pixelMetric(QStyle::PM_MenuButtonIndicator);
+        QRect r((width() - arrowSize)/2, 0, arrowSize, arrowSize);
 
         switch (m_arrowDirection)
         {
@@ -640,27 +641,31 @@
                 break;
             case KPanelExtension::Bottom:
                 e = QStyle::PE_ArrowDown;
-                r.moveBy(0, height() - 8);
+                r.moveBy(0, height() - arrowSize);
                 break;
             case KPanelExtension::Right:
                 e = QStyle::PE_ArrowRight;
-                r.moveBy(width() - 8 , 0);
+                r = QRect(width() - arrowSize, (height() - arrowSize)/2, arrowSize, arrowSize);
                 break;
             case KPanelExtension::Left:
                 e = QStyle::PE_ArrowLeft;
+                r = QRect(0, (height() - arrowSize)/2, arrowSize, arrowSize);
                 break;
             case KPanelExtension::Floating:
                 if (orientation() == Horizontal)
                 {
                     e = QStyle::PE_ArrowDown;
+                    r.moveBy(0, height() - arrowSize);
                 }
                 else if (QApplication::reverseLayout())
                 {
                     e = QStyle::PE_ArrowLeft;
+                    r = QRect(0, (height() - arrowSize)/2, arrowSize, arrowSize);
                 }
                 else
                 {
                     e = QStyle::PE_ArrowRight;
+                    r = QRect(width() - arrowSize, (height() - arrowSize)/2, arrowSize, arrowSize);
                 }
                 break;
         }