[Bug] Extension method highlighting not working properly in manifold-collections

[CC007]

Describe the bug
Highlighting doesn't seem to work in the manifold project itself, for instance for ManIterableExt from manifold-collections.

To Reproduce
Steps to reproduce the behavior:

1. Fork manifold and checkout the master branch in IntelliJ
2. Set the SDK to java 8 (Zulu-8 used in this case)
3. Run mvn clean package
4. Open ManIterableExt from manifold-collections.
5. Click the sync button in the Maven window in IntelliJ (not enough to get it to work)
6. Click File -> Repair IDE and go through all steps (not enough to get it to work)

Expected behavior
I expect highlighting to work

Desktop (please complete the following information):

• OS Type & Version: Windows 10
• Java/JDK version: Zulu-8 (1.8.0_232, vendor: Azul Systems, Inc.)
• maven version: 3.9.2 (c9616018c7a021c1c39be70fb2843d6f5f9b8a1c)
• IDE version (IntelliJ IDEA or Android Studio): IntelliJ 2023.2.2
• Manifold version: 2023.1.26-SNAPSHOT (latest master, commit: 9d2c5902)
• Manifold IntelliJ plugin version: 23.2.2

Screenshots

Additional context
I don't get any IntelliJ stack traces, so it doesn't seem like the Manifold plugin crached.

[rsmckinney]

@CC007 The manifold IJ plugin itself includes core components from manifold, such as the manifold-ext jar. Without getting too deep into the plugin's innards, when developing manifold their are two copies of manifold core types: the .class files included with the manifold jars and the source files in the project. Basically, because manifold itself doesn't depend on jar files of itself, the plugin is unaware of manifold usage.

This is a solvable problem, but one I haven't spent much time resolving as of yet.