#2 .ecore changes ignored when implementing a model

[Massimiliano Zattera]

If you make changes to an existing .ecore using its .editorconfig and then
re-implement the model (right click > Implement...) the changes you made are
not considered unless you saved them.

The changes should be considered even the file is not saved. Eclipse should
eventually save the file before proceeding if it has no other ways of doing
that (maybe after prompting user). Also, would be nice to validate the .ecore
before implementing it.