fix #58807

src/vs/workbench/parts/snippets/electron-browser/snippetsService.ts

@@ -317,6 +317,7 @@ export class SnippetSuggestProvider implements ISuggestSupport {
 		return this._snippets.getSnippets(languageId).then(snippets => {
 
 			let suggestions: SnippetSuggestion[];
+			let shift = Math.max(0, position.column - 100);
 			let pos = { lineNumber: position.lineNumber, column: Math.max(1, position.column - 100) };
 			let lineOffsets: number[] = [];
 			let linePrefixLow = model.getLineContent(position.lineNumber).substr(Math.max(0, position.column - 100), position.column - 1).toLowerCase();
@@ -349,7 +350,8 @@ export class SnippetSuggestProvider implements ISuggestSupport {
 			} else {
 				let consumed = new Set<Snippet>();
 				suggestions = [];
-				for (const start of lineOffsets) {
+				for (let start of lineOffsets) {
+					start -= shift;
 					for (const snippet of snippets) {
 						if (!consumed.has(snippet) && matches(linePrefixLow, start, snippet.prefixLow, 0)) {
 							suggestions.push(new SnippetSuggestion(snippet, linePrefixLow.length - start));

src/vs/workbench/parts/snippets/test/electron-browser/snippetsService.test.ts

@@ -247,4 +247,22 @@ suite('SnippetsService', function () {
 		result = await provider.provideCompletionItems(model, new Position(1, 3), { triggerCharacter: '-', triggerKind: SuggestTriggerKind.TriggerCharacter });
 		assert.equal(result.suggestions.length, 1);
 	});
+
+	test('No snippets suggestion on long lines beyond character 100 #58807', async function () {
+		snippetService = new SimpleSnippetService([new Snippet(
+			['fooLang'],
+			'bug',
+			'bug',
+			'',
+			'second',
+			''
+		)]);
+
+		const provider = new SnippetSuggestProvider(modeService, snippetService);
+
+		let model = TextModel.createFromString('Thisisaverylonglinegoingwithmore100bcharactersandthismakesintellisensebecomea Thisisaverylonglinegoingwithmore100bcharactersandthismakesintellisensebecomea b', undefined, modeService.getLanguageIdentifier('fooLang'));
+		let result = await provider.provideCompletionItems(model, new Position(1, 158), suggestContext);
+
+		assert.equal(result.suggestions.length, 1);
+	});
 });