Multifile query editing issue in Eclipse

[ujhelyiz]

When developing a MagicDraw plugin that uses V4MD, its corresponding Gradle-based build system that has multiple query files, cross-file query references in Eclipse stops working quite regularly: every pattern that is called from another file is marked as one that cannot be found, until the mentioned file is (e.g. by editing it directly or executing a project build). However, after a file is changed again, the issue comes back.

This issue is not strictly related the V4MD, but so far I have only seen this issue with projects that use V4MD and the Gradle-based MagicDraw builds; however, in case of a project with many queries (~700 lines of VQL files in 5 files) the issue is totally reproducible.

My theory is that for some unexpected reason the Xtext Index gets cleaned up during the build, but I have no idea why that happens, it needs further evaluation.

[ujhelyiz]

@lunkpeter has reported that removing the PDE project nature (and corresponding builder) solved the issue.

[ujhelyiz]

@lunkpeter has reported that removing the PDE project nature (and corresponding builder) solved the issue.

This cannot be the entire cause, as I have seen two separate cases where the problem occurred in a non-PDE project.