ui changes

* create UIResizeBorder
* restore miniwindow
* scroll fixes

modules/game/widgets/uiminiwindow.lua

@@ -0,0 +1,36 @@
+UIMiniWindow = extends(UIWindow)
+
+function UIMiniWindow.create()
+  local miniwindow = UIMiniWindow.internalCreate()
+  return miniwindow
+end
+
+function UIMiniWindow:onDragEnter(mousePos)
+  local parent = self:getParent()
+  if not parent then return false end
+
+  if parent:getClassName() == 'UIMiniWindowContainer' then
+    local containerParent = parent:getParent()
+    parent:removeChild(self)
+    containerParent:addChild(self)
+  end
+
+  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)
+  -- TODO: drop on other interfaces
+end
+
+function UIMiniWindow:onFocusChange(focused)
+  -- miniwindows only raises when its outside MiniWindowContainers
+  if not focused then return end
+  local parent = self:getParent()
+  if parent and parent:getClassName() ~= 'UIMiniWindowContainer' then
+    self:raise()
+  end
+end
+