extensions/git/src/decorationProvider.ts/GitDecorationProvider/collectDecorationData
class GitDecorationProvider:	private collectDecorationData(group: GitResourceGroup, bucket: Map<string, FileDecoration>): void {
		for (const r of group.resourceStates) {
			const decoration = r.resourceDecoration;

			if (decoration) {
				// not deleted and has a decoration
				bucket.set(r.original.toString(), decoration);

				if (r.type === Status.INDEX_RENAMED) {
					bucket.set(r.resourceUri.toString(), decoration);
				}
			}
		}
	}