files - mark editor as readonly also based on model knowledge

src/vs/workbench/contrib/files/common/editors/fileEditorInput.ts

@@ -224,7 +224,9 @@ export class FileEditorInput extends TextEditorInput implements IFileEditorInput
 	}
 
 	isReadonly(): boolean {
-		return this.fileService.hasCapability(this.resource, FileSystemProviderCapabilities.Readonly);
+		const model = this.textFileService.models.get(this.resource);
+
+		return model?.isReadonly() || this.fileService.hasCapability(this.resource, FileSystemProviderCapabilities.Readonly);
 	}
 
 	isDirty(): boolean {