fix (core): filter different projects in watch mode

[DevJoaoLopes]

Description

closes #7131

• This PR resolves a bug in watch (-watch) mode where the filter (w key) is not filtering only the tests of a given project

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[sheremet-va]

This should already return only filtered projects because it uses vitest.projects and not vitest.resolvedProjects. Why doesn't it?

[DevJoaoLopes]

Yes, but in those cases where we have different projects defined by defineProject, the filter of files.flatMap(file => this.getModuleSpecifications(file)) is returning TestProjects beyond what it should.
Because of this, one of the possible solutions would be to apply the filter by name.

[sheremet-va]

You just rephrased what I asked. Why does it do that? getModuleSpecification shouldn't include filtered out projects

[DevJoaoLopes]

Sorry, now I understand your question...
getModuleSpecification has the following validation:

const _cached = this.getCachedSpecifications(moduleId)
if (_cached) {
  return _cached
}

When we are re-running the tests with the filters along with --watch it ends up returning the cache projects instead of trying to search again. (Another solution would be to simply remove this validation and cache return).

[DevJoaoLopes]

@sheremet-va Do you have any idea what paths we can take to solve the problem? Insert validation into specificationsWithFilterByProject or remove cache validation for getModuleSpecification ?