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Last mouse pointer focus on a block in multi-level refine windows might not get released

Goals and Symptoms
Last mouse pointer focus on a block in multi-level refine windows might not get released

Facts and Change
Unity version 8 and above..

Causes and Fixes
If you have the multi-level refine windows open on a DFB that is made of multi-level DFB's, the pointer focus for a block
input\output pin on the last opened refine window might not get released when the window is closed.

To demonstrate the issue, assume that the Unity application consists of multiple sections (i.e., "S1", "S2", etc.) with each section
containing a multi layerd DFB.
  • Open a section (i.e., "S1") which consists of a multi layer DFB's (i.e., "G1").
  • Click on "G1" and open the refine window to show another DFB (i.e., "G2")
  • Click on "G2" and open the refine window to show another DFB (i.e., "G3")
  • Click on block in the refine window for "G3" and view the data properties for one of the pins.
  • Open another section (i.e., "S2") which consists of a multi layer DFB's (i.e., "G7").
  • Click on "G7" and open the refine window to show another DFB (i.e., "G8")
  • Click on "G8" and open the refine window to show another DFB (i.e., "G9")
  • Click on block in the refine window for "G9" and view the data properties for one of the pins.
  • Close the refine windows for "G3" and "G9".
  • Go to the refine window for "G8" and click on a pin for a block.
  • If you view the data properties, it will still how the values for the last pin that was selected on the closed refine window for "G9".

Note:  Due to the complexity of the issue, difficulty to fix and possible regression related problems a fix could potentially cause,
           the problem willl not be fixed.

          The work around is to close all of the refine window and re-open the respective refine windows.
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