drag fixes

modules/core_widgets/uiitem.lua

@@ -2,7 +2,7 @@ function UIItem:onDragEnter(mousePos)
   if self:isVirtual() then return false end
 
   local item = self:getItem()
-  if not item then return true end
+  if not item then return false end
 
   self:setBorderWidth(1)
 

modules/core_widgets/uiminiwindow.lua

@@ -24,6 +24,7 @@ function UIMiniWindow:onDragEnter(mousePos)
   local oldPos = self:getPosition()
   self.movingReference = { x = mousePos.x - oldPos.x, y = mousePos.y - oldPos.y }
   self:setPosition(oldPos)
+  return true
 end
 
 function UIMiniWindow:onDragLeave(droppedWidget, mousePos)

modules/core_widgets/uiwindow.lua

@@ -25,6 +25,7 @@ end
 function UIWindow:onDragEnter(mousePos)
   self:breakAnchors()
   self.movingReference = { x = mousePos.x - self:getX(), y = mousePos.y - self:getY() }
+  return true
 end
 
 function UIWindow:onDragLeave(droppedWidget, mousePos)