joh/theoretical quokka (#154157)

* add `SnippetController#apply(ISnippetEdit[])`

This replaces the initial ugly trick with a more sound implementation of arbitrary snippet edits. A snippet edit can cover disconnected regions, each will be applied as separate text edit but everything will become a single `OneSnippet` instance

* add integration test for SnippetString-text edit inside workspace edit

extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts

@@ -1147,4 +1147,27 @@ suite('vscode API - workspace', () => {
 			assert.strictEqual(document.isDirty, false);
 		}
 	});
+
+	test('SnippetString in WorkspaceEdit', async function (): Promise<any> {
+		const file = await createRandomFile('hello\nworld');
+
+		const document = await vscode.workspace.openTextDocument(file);
+		const edt = await vscode.window.showTextDocument(document);
+
+		assert.ok(edt === vscode.window.activeTextEditor);
+
+		const we = new vscode.WorkspaceEdit();
+		we.set(document.uri, [{ range: new vscode.Range(0, 0, 0, 0), newText: '', newText2: new vscode.SnippetString('${1:foo}${2:bar}') }]);
+		const success = await vscode.workspace.applyEdit(we);
+
+
+		if (edt !== vscode.window.activeTextEditor) {
+			return this.skip();
+		}
+
+		assert.ok(success);
+		assert.strictEqual(document.getText(), 'foobarhello\nworld');
+		assert.deepStrictEqual(edt.selections, [new vscode.Selection(0, 0, 0, 3)]);
+
+	});
 });