[Bug 58552] Yabridge plugins GUI is not located on the exact location of the GUI element

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58552

--- Comment #11 from Stian Low  ---
Created attachment 79098
  --> http://bugs.winehq.org/attachment.cgi?id=79098
Improved patch to commit 8fa114fae34 (wine-10.11)

This patch overrides the previous patch with improvements.

The previous patch still had GUI offset issues once a VST window was moved. 
Also, when multiple VST windows were open only the last one that was open was
properly aligned with the mouse.

This patch keeps the mouse aligned even if the VST window is moved and supports
multiple VST windows which can also be moved.