Just ignore settings/shortcut key while typing on tablet

Bug: 5759096
Change-Id: Ie1f1800d0f32ac0938715c79974e0f382c9c3d27

java/res/values/keycodes.xml

@@ -23,6 +23,7 @@
     <integer name="key_tab">9</integer>
     <integer name="key_return">10</integer>
     <integer name="key_space">32</integer>
+    <integer name="key_dummy">0</integer>
     <integer name="key_shift">-1</integer>
     <integer name="key_switch_alpha_symbol">-2</integer>
     <integer name="key_delete">-5</integer>

java/res/xml-sw600dp/kbd_key_styles.xml

@@ -78,14 +78,14 @@
         latin:code="@integer/key_shortcut"
         latin:keyIcon="iconShortcutKey"
         latin:keyActionFlags="noKeyPreview|altCodeWhileTyping"
-        latin:altCode="@integer/key_space"
+        latin:altCode="@integer/key_dummy"
         latin:parentStyle="f2PopupStyle" />
     <key-style
         latin:styleName="settingsKeyStyle"
         latin:code="@integer/key_settings"
         latin:keyIcon="iconSettingsKey"
         latin:keyActionFlags="noKeyPreview|altCodeWhileTyping"
-        latin:altCode="@integer/key_space"
+        latin:altCode="@integer/key_dummy"
         latin:backgroundType="functional" />
     <key-style
         latin:styleName="tabKeyStyle"

java/res/xml-sw768dp/kbd_key_styles.xml

@@ -60,14 +60,14 @@
         latin:code="@integer/key_shortcut"
         latin:keyIcon="iconShortcutKey"
         latin:keyActionFlags="noKeyPreview|altCodeWhileTyping"
-        latin:altCode="@integer/key_space"
+        latin:altCode="@integer/key_dummy"
         latin:backgroundType="functional" />
     <key-style
         latin:styleName="settingsKeyStyle"
         latin:code="@integer/key_settings"
         latin:keyIcon="iconSettingsKey"
         latin:keyActionFlags="noKeyPreview|altCodeWhileTyping"
-        latin:altCode="@integer/key_space"
+        latin:altCode="@integer/key_dummy"
         latin:backgroundType="functional" />
     <key-style
         latin:styleName="tabKeyStyle"

java/src/com/android/inputmethod/keyboard/Keyboard.java

@@ -151,6 +151,9 @@ public class Keyboard {
     }
 
     public Key getKey(int code) {
+        if (code == CODE_DUMMY) {
+            return null;
+        }
         final Integer keyCode = code;
         if (mKeyCache.containsKey(keyCode)) {
             return mKeyCache.get(keyCode);