When at a non-leaf node, refinements with identical type signatures
are highlighting and can re placed without destroying the children.
If not, the refinement is greyed and the user is asked to clear
the current subtree first if they wish to replace it.
This aspect of the UI should be polished, but at least it is obvious.
Also, some substantial optimizations can still be made to cache
the processed type signatures (which determine what can be replaced
in-place)
+ Transfer current astract syntax tree when activating the syntax editor
from the minibar.
+ Add options to start the minibar with given input. You need to include
the current grammar url, the current language and the input, like this:
initial_grammar: "/grammars/Foods.pgf",
initial: { from: "FoodsEng", input:["that","fish","is","fresh"]}
+ Fix a style sheet clash.
