Language server unknown fragment inconsistency

[p-szm]

When using a fragment that's not defined, the language server correctly reports the error:

however, after saving the file, the error disappears:

This seems to be due to the fact that when a file is modified, we call getDiagnostics with only two arguments (and isRelayCompatMode defaults to false):

graphiql/packages/graphql-language-service-server/src/MessageProcessor.ts

Line 368 in 94f7344

const results = await this._languageService.getDiagnostics(query, uri);

while when a file is saved, we call getDiagnostics with three arguments, and for some reason we invert the value of isRelayCompatMode:

graphiql/packages/graphql-language-service-server/src/MessageProcessor.ts

Lines 293 to 297 in 94f7344

	const results = await this._languageService.getDiagnostics(
	query,
	uri,
	this._isRelayCompatMode(query) ? false : true,
	);

[p-szm]

I opened a PR that I believe is a fix for this #1964

[ebsangam]

It is happening again.