Add leading whitespace offset to lookup offset (fixes #59343) (#59537)

src/vs/base/common/octicon.ts

@@ -118,7 +118,7 @@ export function matchesFuzzyOcticonAware(query: string, target: IParsedOcticons,
 	// Map matches back to offsets with octicons and trimming
 	if (matches) {
 		for (let i = 0; i < matches.length; i++) {
-			const octiconOffset = octiconOffsets[matches[i].start] /* octicon offsets at index */ + leadingWhitespaceOffset /* overall leading whitespace offset */;
+			const octiconOffset = octiconOffsets[matches[i].start + leadingWhitespaceOffset] /* octicon offsets at index */ + leadingWhitespaceOffset /* overall leading whitespace offset */;
 			matches[i].start += octiconOffset;
 			matches[i].end += octiconOffset;
 		}

src/vs/base/test/common/octicon.test.ts

@@ -59,5 +59,10 @@ suite('Octicon', () => {
 		filterOk(matchesFuzzyOcticonAware, 'indent', parseOcticons('This $octicon Indent Using Spaces'), [
 			{ start: 14, end: 20 },
 		]);
+
+		// Testing #59343
+		filterOk(matchesFuzzyOcticonAware, 'unt', parseOcticons('$(primitive-dot) $(file-text) Untitled-1'), [
+			{ start: 30, end: 33 },
+		]);
 	});
 });