Force ToolTip to the outermost layer

TermTk/TTkCore/helper.py

@@ -527,6 +527,8 @@ class TTkHelper:
             y = my+1
         else: # Draw above the Mouse
             y = max(0,my-th)
+        wi = tt.widgetItem()
+        wi.setLayer(wi.LAYER3)
         tt.move(x,y)
         TTkHelper._rootWidget.rootLayout().addWidget(tt)
         tt.raiseWidget()

TermTk/TTkLayouts/layout.py

@@ -45,7 +45,7 @@ class TTkLayoutItem:
     LAYER1    =  0x40000000
     LAYER2    =  0x80000000
     LAYER3    =  0xC0000000
-    LAYERMASK = ~0xC0000000
+    LAYERMASK = ~(LAYER0 | LAYER1 | LAYER2 | LAYER3)
 
     __slots__ = (
         '_x', '_y', '_z', '_w', '_h',