Trigger IME switcher by long-pressing space key

Long press time out for space key is set to 1000msec.
FYI: Time out for shift key is 1200ms and for mini popup keyboard is 400ms.

Bug: 4971680
Change-Id: Id05f519baa15ca2e54958997ddf7b6b3b7a2d078
diff --git a/java/res/values-sw768dp/config.xml b/java/res/values-sw768dp/config.xml
index 2828f9d..8260568 100644
--- a/java/res/values-sw768dp/config.xml
+++ b/java/res/values-sw768dp/config.xml
@@ -35,6 +35,8 @@
     <!-- Showing mini keyboard, just above the touched point if true, aligned to the key if false -->
     <bool name="config_show_mini_keyboard_at_touched_point">true</bool>
     <integer name="config_delay_update_suggestions">180</integer>
+    <!-- Long pressing space will invoke IME switcher if > 0, never invoke IME switcher if == 0 -->
+    <integer name="config_long_press_space_key_timeout">0</integer>
     <!-- This configuration is the index of the array {@link KeyboardSwitcher.KEYBOARD_THEMES}. -->
     <string name="config_default_keyboard_theme_id" translatable="false">5</string>
     <string name="config_text_size_of_language_on_spacebar" translatable="false">medium</string>