DevTools: appropriately hide the source map infobar

third_party/WebKit/Source/devtools/front_end/sources/JavaScriptSourceFrame.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1229 matching lines @@
     newScriptFile.addEventListener(Bindings.ResourceScriptFile.Events.DidDivergeFromVM, this._didDivergeFromVM, this);
     if (this.loaded)
       newScriptFile.checkMapping();
     this._showSourceMapInfobar(newScriptFile.hasSourceMapURL());
   }
 
   /**
    * @param {boolean} show
    */
   _showSourceMapInfobar(show) {
-    if (this._sourceMapInfobar) {
-      if (!show) {
+    if (!show) {
+      if (this._sourceMapInfobar) {
         this._sourceMapInfobar.dispose();
         delete this._sourceMapInfobar;
       }
       return;
     }
+    if (this._sourceMapInfobar)
+      return;
     this._sourceMapInfobar = UI.Infobar.create(
         UI.Infobar.Type.Info, Common.UIString('Source Map detected.'),
         Common.settings.createSetting('sourceMapInfobarDisabled', false));
     if (this._sourceMapInfobar) {
       this._sourceMapInfobar.createDetailsRowMessage(Common.UIString(
           'Associated files should be added to the file tree. You can debug these resolved source files as regular JavaScript files.'));
       this._sourceMapInfobar.createDetailsRowMessage(Common.UIString(
           'Associated files are available via file tree or %s.',
           UI.shortcutRegistry.shortcutTitleForAction('quickOpen.show')));
       this._sourceMapInfobar.setCloseCallback(() => delete this._sourceMapInfobar);
@@ skipping 260 matching lines @@
       return;
     this.bookmark.clear();
     this.bookmark = null;
   }
 };
 
 Sources.JavaScriptSourceFrame.BreakpointDecoration.bookmarkSymbol = Symbol('bookmark');
 Sources.JavaScriptSourceFrame.BreakpointDecoration._elementSymbolForTest = Symbol('element');
 
 Sources.JavaScriptSourceFrame.continueToLocationDecorationSymbol = Symbol('bookmark');