Stop further keymap state traversal after a miss.

In theory this further traversal can only lead to trouble when an
operator is forgotten in the keymap states. In practice this might
occur, so stop this from happening as extra foolproofing.

Added extra test, though this isn't for the problem described above.

Fixes #415.

net.sourceforge.vrapper.core.tests/src/net/sourceforge/vrapper/core/tests/cases/RemappingTests.java

@@ -224,6 +224,19 @@ public void testMotionsWithoutOMap() {
         checkCommand(forKeySeq("dams"),
                 "so old", ' ', "McDonnaLD had some $LLaz",
                 "", 'o', "me $LLaz");
+
+        // sanity check
+        checkCommand(forKeySeq("df0"),
+                "so old", ' ', "McD0nnaLD had some $LLaz",
+                "so old", 'n', "naLD had some $LLaz");
+
+        type(parseKeyStrokes(":onoremap 0 0x<CR>"));
+        checkCommand(forKeySeq("d0"),
+                "so old", ' ', "McD0nnaLD had some $LLaz",
+                "", 'M', "cD0nnaLD had some $LLaz");
+        checkCommand(forKeySeq("df0"),
+                "so old", ' ', "McD0nnaLD had some $LLaz",
+                "so old", 'n', "naLD had some $LLaz");
     }
 
     @Test

net.sourceforge.vrapper.core/src/net/sourceforge/vrapper/vim/modes/KeyMapResolver.java

@@ -30,17 +30,16 @@ public final class KeyMapResolver {
     public void press(KeyStroke key) {
         if (currentState != null) {
             Transition<String> trans = currentState.press(key);
-            if (trans != null) {
+            if (trans == null) {
+                currentState = null;
+                lastValue = null;
+            } else {
                 currentState = trans.getNextState();
+                lastValue = trans.getValue();
             }
-            lastValue = getValue(trans);
         }
     }
 
-    private String getValue(Transition<String> trans) {
-        return trans != null ? trans.getValue() : null;
-    }
-
     public String getKeyMapName() {
         return lastValue;
     }