src/vs/editor/contrib/suggest/browser/suggestInlineCompletions.ts/SuggestInlineCompletions/_getTriggerCharacterInfo
class SuggestInlineCompletions:	private _getTriggerCharacterInfo(model: ITextModel, position: IPosition) {
		const ch = model.getValueInRange(Range.fromPositions({ lineNumber: position.lineNumber, column: position.column - 1 }, position));
		const providers = new Set<CompletionItemProvider>();
		for (const provider of this._languageFeatureService.completionProvider.all(model)) {
			if (provider.triggerCharacters?.includes(ch)) {
				providers.add(provider);
			}
		}
		if (providers.size === 0) {
			return undefined;
		}
		return { providers, ch };
	}