MMStudio: Fix poor GUI response during Live with large images

There was a loophole in the "canvas paint pending" mechanism, such that
unwanted paints were being triggered.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14718 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
ASIdiSPIM plugin: avoid error caused by missing PixelType tag

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14719 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
ASIdiSPIM plugin: Center dialog coming from Navigation panel on the diSPIM plugin rather than the center of the main screen

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14720 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd