Add context menu "copy" option to help. Bug 298950, patch by Martijn Wargers

<martijn.martijn@gmail.com>, r=mconnor

toolkit/components/help/content/help.xul

@@ -104,6 +104,8 @@
     <command id="cmd_find" oncommand="onFindCmd();"/>
     <command id="cmd_findAgain" oncommand="onFindAgainCmd();"/>
     <command id="cmd_findPrevious" oncommand="onFindPreviousCmd();"/>
+    <command id="cmd_copy" oncommand="goDoCommand('cmd_copy')" disabled="true"/>
+    <command id="cmd_selectAll" oncommand="goDoCommand('cmd_selectAll')"/>
   </commandset>
   <keyset id="keys">
     <key id="goHome"      keycode="VK_HOME"  command="Help:Home" modifiers="alt"/>

toolkit/components/help/content/helpContextOverlay.xul

@@ -44,7 +44,8 @@
 
 # Help Window's right-click menu
   <popupset id="contentAreaContextSet">
-    <popup id="contentAreaContextMenu">
+    <popup id="contentAreaContextMenu"
+           onpopupshowing="goUpdateCommand('cmd_copy')">
       <menuitem id="context-back"
                 label="&backButton.label;"
                 accesskey="&backButton.accesskey;"
@@ -60,6 +61,16 @@
                 accesskey="&reloadCmd.accesskey;"
                 oncommand="reload();"/>
       <menuseparator/>
+      <menuitem id="context-copy"
+                label="&copyCmd.label;"
+                accesskey="&copyCmd.accesskey;"
+                command="cmd_copy"
+                disabled="true"/>
+      <menuitem id="context-selectall"
+                label="&selectAllCmd.label;"
+                accesskey="&selectAllCmd.accesskey;"
+                command="cmd_selectAll"/>
+      <menuseparator/>
       <menuitem id="zoom-in"
       		label="&textZoomEnlargeBtn.label;"
       		accesskey="&textZoomEnlargeBtn.accesskey;"

toolkit/locales/en-US/chrome/mozapps/help/help.dtd

@@ -10,6 +10,10 @@
 <!ENTITY forwardButton.label            "Forward">
 <!ENTITY forwardButton.accesskey        "F">
 <!ENTITY forwardButton.tooltip          "Go forward one page">
+<!ENTITY copyCmd.label                  "Copy">
+<!ENTITY copyCmd.accesskey              "C">
+<!ENTITY selectAllCmd.label             "Select All">
+<!ENTITY selectAllCmd.accesskey         "A">
 <!ENTITY goBackCmd.commandkey           "[">
 <!ENTITY goForwardCmd.commandkey        "]">
 <!ENTITY homeButton.label               "Home">

toolkit/themes/winstripe/help/help.css

@@ -68,3 +68,7 @@ menubutton:not([disabled="true"]):hover:active {
 
 #help-print-button { -moz-image-region: rect(0px 96px 24px 72px); }
 #help-print-button:hover { -moz-image-region: rect(24px 96px 48px 72px); }
+
+#context-copy[disabled="true"] {
+  visibility: collapse;
+}