Fix a logic flaw.

This test is seriously wrong : although we do have a method that
does exactly the right thing, this looks at a very specific, unrelated
variable state in hope it happens to be set only in the relevant
cases by the play of logic.
I don't think this changes anything concretely, as the assumption
was probably true in the practice ; still, this code is very hard to
read and prone to unexpected breakage.

Change-Id: I77ab576f90762429fcc752df31ed30e1c81871dc

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

@@ -1619,8 +1619,7 @@ public final class LatinIME extends InputMethodService implements KeyboardAction
         if (mWordComposer.isComposingWord()) {
             final int length = mWordComposer.size();
             if (length > 0) {
-                // Immediately after a batch input.
-                if (SPACE_STATE_PHANTOM == spaceState) {
+                if (mWordComposer.isBatchMode()) {
                     mWordComposer.reset();
                 } else {
                     mWordComposer.deleteLast();