Bug 1063669 - Don't enable e10s if IME is detected (r=jimm)

browser/components/nsBrowserGlue.js

@@ -2287,6 +2287,7 @@ let E10SUINotification = {
 
       if (!Services.appinfo.inSafeMode &&
           !Services.appinfo.accessibilityEnabled &&
+          !Services.appinfo.keyboardMayHaveIME &&
           e10sPromptShownCount < 5) {
         Services.tm.mainThread.dispatch(() => {
           try {

toolkit/xre/nsAppRunner.cpp

@@ -584,6 +584,28 @@ CanShowProfileManager()
 #endif
 }
 
+static bool
+KeyboardMayHaveIME()
+{
+#ifdef XP_WIN
+  // http://msdn.microsoft.com/en-us/library/windows/desktop/dd318693%28v=vs.85%29.aspx
+  HKL locales[10];
+  int result = GetKeyboardLayoutList(10, locales);
+  for (int i = 0; i < result; i++) {
+    int kb = (unsigned)locales[i] & 0xFFFF;
+    if (kb == 0x0411 ||  // japanese
+        kb == 0x0412 ||  // korean
+        kb == 0x0C04 ||  // HK Chinese
+        kb == 0x0804 || kb == 0x0004 || // Hans Chinese
+        kb == 0x7C04 || kb ==  0x0404)  { //Hant Chinese
+
+      return true;
+    }
+  }
+#endif
+
+  return false;
+}
 
 bool gSafeMode = false;
 
@@ -845,6 +867,13 @@ nsXULAppInfo::GetAccessibilityEnabled(bool* aResult)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsXULAppInfo::GetKeyboardMayHaveIME(bool* aResult)
+{
+  *aResult = KeyboardMayHaveIME();
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsXULAppInfo::EnsureContentProcess()
 {
@@ -4541,8 +4570,9 @@ bool
 mozilla::BrowserTabsRemoteAutostart()
 {
   if (!gBrowserTabsRemoteAutostartInitialized) {
+    bool hasIME = KeyboardMayHaveIME();
     bool prefEnabled = Preferences::GetBool("browser.tabs.remote.autostart", false) ||
-                       Preferences::GetBool("browser.tabs.remote.autostart.1", false);
+                       (Preferences::GetBool("browser.tabs.remote.autostart.1", false) && !hasIME);
     bool disabledForA11y = Preferences::GetBool("browser.tabs.remote.autostart.disabled-because-using-a11y", false);
     gBrowserTabsRemoteAutostart = !gSafeMode && !disabledForA11y && prefEnabled;
 

xpcom/system/nsIXULRuntime.idl

@@ -25,7 +25,7 @@ bool BrowserTabsRemoteAutostart();
  *                    stable/frozen, please contact Benjamin Smedberg.
  */
 
-[scriptable, uuid(77550b90-3b67-11e4-916c-0800200c9a66)]
+[scriptable, uuid(789073a0-3f4a-11e4-916c-0800200c9a66)]
 interface nsIXULRuntime : nsISupports
 {
   /**
@@ -104,6 +104,13 @@ interface nsIXULRuntime : nsISupports
    */
   readonly attribute boolean accessibilityEnabled;
 
+  /**
+   * This returns a very rough approximation of whether IME is likely
+   * to be used for the browser session. DO NOT USE! This is temporary
+   * and will be removed.
+   */
+  readonly attribute boolean keyboardMayHaveIME;
+
   /**
    * Signal the apprunner to invalidate caches on the next restart.
    * This will cause components to be autoregistered and all