Improved validation in graphical flow creation tools

[philip-alldredge]

Issue by philip-alldredge
Wednesday Feb 14, 2018 at 16:38 GMT
Originally opened as osate/osate-ge#296

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The validation for the flow creation tools has been reduced because they were previously over constrained. They should be improved to allow the full capabilities of the language but to provide useful validation for when the flow being created would cause an error in the resulting model. Ideally, this would reuse the validation which is part of the text editor.

Additionally, need to test and support creating flows that extend to the subprogram calls. This can be confusing because IIRC, the flow must reference a subprogram subcomponent which is referenced by the call. Should check highlighting in that case too.