Fix microsoft/vscode-pull-request-github#129. Diff Editor should not reset the...

Fix microsoft/vscode-pull-request-github#129. Diff Editor should not reset the gutter width everytime.

src/vs/editor/browser/widget/diffEditorWidget.ts

@@ -944,7 +944,7 @@ export class DiffEditorWidget extends Disposable implements editorBrowser.IDiffE
 		clonedOptions.folding = false;
 		clonedOptions.codeLens = false;
 		clonedOptions.fixedOverflowWidgets = true;
-		clonedOptions.lineDecorationsWidth = '2ch';
+		// clonedOptions.lineDecorationsWidth = '2ch';
 		if (!clonedOptions.minimap) {
 			clonedOptions.minimap = {};
 		}

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

@@ -232,6 +232,7 @@ export class TextDiffEditor extends BaseTextEditor implements ITextDiffEditor {
 		const options: IDiffEditorOptions = super.getConfigurationOverrides();
 
 		options.readOnly = this.isReadOnly();
+		options.lineDecorationsWidth = '2ch';
 
 		return options;
 	}