Bug 1357206 followup: fix the Windows key issues in devtools tests and reenable the new behavior.

devtools/client/debugger/new/test/mochitest/head.js

@@ -553,7 +553,17 @@ function invokeInTab(fnc) {
 }
 
 const isLinux = Services.appinfo.OS === "Linux";
+const isMac = Services.appinfo.OS === "Darwin";
 const cmdOrCtrl = isLinux ? { ctrlKey: true } : { metaKey: true };
+// On Mac, going to beginning/end only works with meta+left/right.  On
+// Windows, it only works with home/end.  On Linux, apparently, either
+// ctrl+left/right or home/end work.
+const endKey = isMac ?
+      { code: "VK_RIGHT", modifiers: cmdOrCtrl } :
+      { code: "VK_END" };
+const startKey = isMac ? 
+      { code: "VK_LEFT", modifiers: cmdOrCtrl } :
+      { code: "VK_HOME" };
 const keyMappings = {
   sourceSearch: { code: "p", modifiers: cmdOrCtrl },
   fileSearch: { code: "f", modifiers: cmdOrCtrl },
@@ -562,8 +572,8 @@ const keyMappings = {
   Down: { code: "VK_DOWN" },
   Right: { code: "VK_RIGHT" },
   Left: { code: "VK_LEFT" },
-  End: { code: "VK_RIGHT", modifiers: cmdOrCtrl },
-  Start: { code: "VK_LEFT", modifiers: cmdOrCtrl },
+  End: endKey,
+  Start: startKey,
   Tab: { code: "VK_TAB" },
   Escape: { code: "VK_ESCAPE" },
   pauseKey: { code: "VK_F8" },

modules/libpref/init/all.js

@@ -1253,7 +1253,7 @@ pref("dom.input.dirpicker", false);
 
 // Enable not moving the cursor to end when a text input or textarea has .value
 // set to the value it already has.  By default, enabled.
-pref("dom.input.skip_cursor_move_for_same_value_set", false);
+pref("dom.input.skip_cursor_move_for_same_value_set", true);
 
 // Enables system messages and activities
 pref("dom.sysmsg.enabled", false);