It took me a while to find out why some methods in the Dart Editor were being shown
like this - this means the method or property is deprecated.
Turns out work is going on to improve this - they will appear as build warnings too and not just in the Editor. I was looking at bit of code using Path and the tool tip stated that Path was deprecated and the exact day it would be removed in August. (No screenshot sorry!). As the libraries progress, most developers will appreciate this feature especially on larger projects.