Setting a modal path to in-mode does not reflect change

[RyanMcilnay]

Summary

When setting a modal path to in-mode using the graphical editor AADL properties view, no change occurs. The in-mode looks like it is set and then removed simultaneously.
We suspect it has something to do with the latest changes made for #1449.

Steps to Reproduce

1. Create type classifier
2. Create mode, feature, and flow spec
3. Select the flow spec
4. Open properties view
5. Click the mode in the in-mode section

package Test
public
	abstract t
		features
			feat: in feature;
		flows
			f_sink: flow sink feat;
		modes
			m1: mode;
	end t;
end Test;

Environment

• OSATE Version: 2.3.5 Release
• Operating System: Windows 10

[philip-alldredge]

This is a regression from 2.3.4. I suspect it has something to do with out Xtext updates the resource after changes to the model. The model change does not cause a change in the AADL source.

@RyanMcilnay please open an issue for creating an automated test to detect such regressions.