Introduced a change from the MonoDevelop Docking library which stops docked palettes resizing when the window is resized.
Introduced a change from the MonoDevelop Docking library which stops
docked palettes resizing when the window is resized.

Mailaender/Pinta,jakeclawson/Pinta,Mailaender/Pinta,Fenex/Pinta,jakeclawson/Pinta,PintaProject/Pinta,Fenex/Pinta,PintaProject/Pinta,PintaProject/Pinta