extensions/configuration-editing/src/settingsDocumentHelper.ts/SettingsDocument/isCompletingPropertyValue
class SettingsDocument:	private isCompletingPropertyValue(location: Location, pos: vscode.Position) {
		if (location.isAtPropertyKey) {
			return false;
		}
		const previousNode = location.previousNode;
		if (previousNode) {
			const offset = this.document.offsetAt(pos);
			return offset >= previousNode.offset && offset <= previousNode.offset + previousNode.length;
		}
		return true;
	}