Bug 896687 - remove PanelUI-mainView-spring, r=Unfocused

browser/components/customizableui/content/panelUI.inc.xul

@@ -15,8 +15,6 @@
         <vbox id="PanelUI-contents"/>
       </vbox>
 
-      <vbox id="PanelUI-mainView-spring"/>
-
       <footer id="PanelUI-footer">
         <!-- The parentNode is used so that the footer is presented as the anchor
              instead of just the button being the anchor. -->

browser/themes/shared/customizableui/customizeMode.inc.css

@@ -63,10 +63,6 @@
   flex-direction: column;
 }
 
-#customization-panelHolder > #PanelUI-mainView > #PanelUI-mainView-spring {
-  display: none;
-}
-
 #main-window[customizing] .customization-target {
   min-width: 100px;
   padding-left: 10px;

browser/themes/shared/customizableui/panelUIOverlay.inc.css

@@ -27,19 +27,11 @@
   -moz-box-flex: 1;
 }
 
-#PanelUI-mainView-spring {
-  flex: auto;
-}
-
 #PanelUI-mainView {
   display: flex;
   flex-direction: column;
 }
 
-.panel-viewstack[viewtype="main"] > .panel-mainview > #PanelUI-mainView > #PanelUI-mainView-spring {
-  display: none;
-}
-
 #app-extension-point-end > #PanelUI-menu-button {
   padding: 2px 5px;
 }
@@ -106,6 +98,7 @@ panelview:not([mainview]) .toolbarbutton-text,
   width: @menuPanelWidth@;
   padding-left: 5px;
   padding-right: 5px;
+  flex: auto;
 }
 
 #edit-controls@inAnyPanel@ > toolbarbutton > .toolbarbutton-icon,