Fix: Chat "Files & Folders" context picker returns no results when searching by file name (#296300)

* Initial plan

* Fix chat context Files & Folders search not returning results by name

Co-authored-by: jrieken <1794099+jrieken@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jrieken <1794099+jrieken@users.noreply.github.com>

Author: Copilot

src/vs/workbench/contrib/search/browser/searchChatContext.ts

@@ -254,7 +254,7 @@ export async function searchFilesAndFolders(
 
 	let searchResult: ISearchComplete | undefined;
 	try {
-		searchResult = await searchService.fileSearch({ ...searchOptions, filePattern: `{**/${segmentMatchPattern}/**,${pattern}}` }, token);
+		searchResult = await searchService.fileSearch({ ...searchOptions, filePattern: `{**/${segmentMatchPattern}/**,**/${segmentMatchPattern}}` }, token);
 	} catch (e) {
 		if (!isCancellationError(e)) {
 			throw e;