bug 207260 - (osx) cmd-m should not open mail compose window. r=jag, sr=sspitzer

suite/browser/mac/platformMailOverlay.xul

@@ -0,0 +1,12 @@
+<?xml version="1.0"?>
+
+<!DOCTYPE overlay SYSTEM "chrome://navigator/locale/mailNavigatorOverlay.dtd">
+
+<overlay id="platformMailOverlay.xul"
+         xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+  <keyset id="tasksKeys">
+    <key id="key_newMessage" key="&newMessageCmd.key;" modifiers="accel,shift" command="cmd_newMessage"/>
+  </keyset>
+
+</overlay>

suite/browser/mailNavigatorOverlay.xul

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 
-<!-- retrieve generic commands -->
+<?xul-overlay href="chrome://navigator/content/platformMailOverlay.xul"?>
 
 <!DOCTYPE overlay SYSTEM "chrome://navigator/locale/mailNavigatorOverlay.dtd" >
 
@@ -191,7 +191,7 @@
               label="&newMessageCmd.label;"
               accesskey="&newMessageCmd.accesskey;"
               command="cmd_newMessage"
-              key="key_newMessage"
+              key="key_newMessage"           
               insertafter="navBeginGlobalNewItems"/>
   </menupopup>
 

suite/browser/unix/platformMailOverlay.xul

@@ -0,0 +1,6 @@
+<?xml version="1.0"?>
+
+<overlay id="platformMailOverlay.xul"
+         xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+</overlay>

suite/browser/win/platformMailOverlay.xul

@@ -0,0 +1,6 @@
+<?xml version="1.0"?>
+
+<overlay id="platformMailOverlay.xul"
+         xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+</overlay>