fix the problem taht PageUp/PageDown/Up/Down/Left/Right/Home/End does not work after we land the keyevent branch. add missing isMeta code there

widget/src/gtk/nsGtkEventHandler.cpp

@@ -300,6 +300,7 @@ void InitKeyEvent(GdkEventKey *aGEK,
     anEvent.isShift = (aGEK->state & GDK_SHIFT_MASK) ? PR_TRUE : PR_FALSE;
     anEvent.isControl = (aGEK->state & GDK_CONTROL_MASK) ? PR_TRUE : PR_FALSE;
     anEvent.isAlt = (aGEK->state & GDK_MOD1_MASK) ? PR_TRUE : PR_FALSE;
+    anEvent.isMeta = (aGEK->state & GDK_MOD2_MASK) ? PR_TRUE : PR_FALSE;
     anEvent.point.x = 0;
     anEvent.point.y = 0;
   }
@@ -323,7 +324,10 @@ void InitKeyPressEvent(GdkEventKey *aGEK,
     anEvent.isAlt = (aGEK->state & GDK_MOD1_MASK) ? PR_TRUE : PR_FALSE;
     anEvent.isMeta = (aGEK->state & GDK_MOD2_MASK) ? PR_TRUE : PR_FALSE;
 
-    anEvent.charCode = nsConvertCharCodeToUnicode(aGEK);
+    if(aGEK->length)
+       anEvent.charCode = nsConvertCharCodeToUnicode(aGEK);
+    else 
+       anEvent.charCode = 0;
 
     if (anEvent.charCode)
       anEvent.keyCode = 0;
@@ -595,6 +599,7 @@ static gint composition_draw(GdkEventKey *aEvent, nsWindow *aWin,
   textEvent.isShift = (aEvent->state & GDK_SHIFT_MASK) ? PR_TRUE : PR_FALSE;
   textEvent.isControl = (aEvent->state & GDK_CONTROL_MASK) ? PR_TRUE : PR_FALSE;
   textEvent.isAlt = (aEvent->state & GDK_MOD1_MASK) ? PR_TRUE : PR_FALSE;
+  textEvent.isMeta = (aEvent->state & GDK_MOD2_MASK) ? PR_TRUE : PR_FALSE;
   textEvent.eventStructType = NS_TEXT_EVENT;
   aWin->DispatchEvent(&textEvent, *aStatus);
 
@@ -757,6 +762,9 @@ gint handle_key_press_event(GtkWidget *w, GdkEventKey* event, gpointer p)
       InitKeyPressEvent(event,p, kevent);
       win->OnKey(kevent);
     }
+  } else { // for Home/End/Up/Down/Left/Right/PageUp/PageDown key
+    InitKeyPressEvent(event,p, kevent);
+    win->OnKey(kevent);
   }
 #else
   if (event->length) {