Success! Looks like we've fixed this one. According to our records the fix was applied for
a recent build.
Ext JS Premium Member
Top level instances are not stretching to fit available canvas when size cleared
Environment : ExtJs 4.0.x
In the latest version of the designer the border layout needs a height specified.
As my views are all going to be viewed within a viewport this makes no sense.
I am now forced to put a height to be able to design anything and then remove before saving/deploying...