Revert "What should happen when on a read-only filesystem? (fix #148304…

…)"

This reverts commit 0cb3913.

src/vs/workbench/browser/parts/editor/editorPanes.ts

@@ -186,13 +186,12 @@ export class EditorPanes extends Disposable {
 			if (result.choice !== cancelId && errorActions) {
 				const errorAction = errorActions[result.choice];
 				if (errorAction) {
-					try {
-						await errorAction.run();
-
-						errorHandled = true; // consider the error as handled
-					} catch (error) {
-						this.dialogService.show(Severity.Error, toErrorMessage(error));
+					const result = errorAction.run();
+					if (result instanceof Promise) {
+						result.catch(error => this.dialogService.show(Severity.Error, toErrorMessage(error)));
 					}
+
+					errorHandled = true; // consider the error as handled!
 				}
 			}
 		}