Contextmenus on dpi-aware application have a wrong scaling

[moby42]

Situation : multimonitor setup:

• monitor 1 : 4k with 125% scaling
• monitor 2 : HD with 100% scaling
  Application runs on second monitor : the contextmenu's on the document & anchorable's Tab are too large (scaled on 125%?).
  I narrowed it don toe the DropDownControlArea class where the DropDowncontextMenu.PlacementTarget is null. Since the target is not defined, wpf assumes the scaling of the main monitor (125%) and shows the contextmenu far too large.

Include a patch file with the fix

AvalonDock-DropDownArea-DpiAware-fix.patch.txt

[Dirkster99]

Hi Thanks for your contribution. I was not able to replicate your problem although I have similar monitor settings but I applied your fix since it does not seem to introduce new issues for me - please test the mater branch and let me know if this does not work for you...

Thanx Dirk