src/vs/workbench/contrib/comments/browser/commentsEditorContribution.ts/CommentController/isEditorInlineOriginal
class CommentController:	private isEditorInlineOriginal(editorURI: URI | undefined, activeEditor: EditorInput | undefined): activeEditor is DiffEditorInput {
		if (editorURI && activeEditor instanceof DiffEditorInput && !this.configurationService.getValue('diffEditor.renderSideBySide')) {
			return activeEditor.original.resource?.toString() === editorURI.toString();
		}
		return false;
	}