Fix issues with long-pressing the spacebar

java/res/values/keycodes.xml

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

.../android/inputmethod/keyboard/KeyboardActionListener.java

...c/com/android/inputmethod/keyboard/LatinKeyboardView.java

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

...m/android/inputmethod/keyboard/PopupMiniKeyboardView.java

java/src/com/android/inputmethod/latin/LatinIME.java

java/src/com/android/inputmethod/latin/Utils.java