Hide tabeditor when it has no tab; b=355655, r=laurent@xulfr.org

composer/base/content/composer/bindings/tabeditor.xml

@@ -13,7 +13,7 @@
    - for the specific language governing rights and limitations under the
    - License.
    -
-   - The Original Code is Mozilla Composer.
+   - The Original Code is Composer.
    -
    - The Initial Developer of the Original Code is
    - Disruptive Innovations SARL.
@@ -61,8 +61,7 @@
           <xul:tabs flex="1" class="tabbrowser-tabs" anonid="EditorTabs" closebutton="true"
                     setfocus="false" onselect="onTabSelected(event)"/>
         </xul:hbox>
-        <xul:tabpanels anonid="EditorTabpanels" selectedIndex="0" flex="1"
-                       style="border: red solid thick; background-color: gray ! important"/>
+        <xul:tabpanels anonid="EditorTabpanels" selectedIndex="0" flex="1" />
       </xul:tabbox>
     </content>
 
@@ -274,6 +273,8 @@
             this.selectedIndex = this.mTabpanels.childNodes.length - 1;
             window.EditorLoadUrl(newEditorElement, aURL);
 
+            this.setAttribute("visibility", "visible");
+
             return {tab: newTab, panel: newEditorElement};
           ]]>
         </body>

composer/base/content/composer/composer.xul

@@ -87,7 +87,7 @@
     <sidebar id="sidebar1" sidebaritems="" persist="sidebaritems"/>
     <splitter id="splitter1" collapse="before" resizebefore="closest"/>
     <vbox flex="1">
-      <tabeditor id="tabeditor" flex="1"/>
+      <tabeditor id="tabeditor" flex="1" visibility="hidden"/>
       <hbox>
         <label value="structure toolbar" />
       </hbox>

composer/base/skin/classic/composer/composer.css

@@ -49,6 +49,10 @@ tabeditor {
   -moz-binding: url('chrome://composer/content/bindings/tabeditor.xml#tabeditor');
 }
 
+tabeditor[visibility="hidden"] {
+  visibility: hidden;
+}
+
 #composer-throbber {
   list-style-image: url('chrome://composer/skin/logo.png');
 }