I have 2 screens setup: latop + external monitor connected through hdmi. Both screens have separate panels with tasks managers configured a bit different. 

I have application runnig on screen 2. Than i have added new default panel on screen 1 and removed it. Now my application minimize effect direction points to removed panel/task manager so ot is completly wrong :)

Reproducible: Always

Steps to Reproduce:
1. Run some app and have it displayed on current panel task manager
2. Add next/new defaulr panel to the desktop
3. Remove this new panel

Actual Results:  
Running application will be minimized to the direction of removed panel - task manager it contained not the existing instance.

Expected Results:  
Application should be minimized to the existing task manager instance on the current screen not removed one.