[textile mode] Require non-space characters directly inside phrase modifiers

Issue #2967

mode/textile/test.js

@@ -411,4 +411,7 @@
 
   MT('phrase-non-word',
      '[negative -x-] aaa-bbb ccc-ddd [negative -eee-] fff [negative -ggg-]');
+
+  MT('phrase-lone-dash',
+     'foo - bar - baz');
 })();

mode/textile/textile.js

@@ -117,14 +117,16 @@
   }
 
   function togglePhraseModifier(stream, state, phraseModifier, closeRE, openSize) {
+    var charBefore = stream.pos > openSize ? stream.string.charAt(stream.pos - openSize - 1) : null;
+    var charAfter = stream.peek();
     if (state[phraseModifier]) {
-      if (stream.match(/^($|\W)/, false)) {
+      if ((!charAfter || /\W/.test(charAfter)) && charBefore && /\S/.test(charBefore)) {
         var type = tokenStyles(state);
         state[phraseModifier] = false;
         return type;
       }
-    } else if ((stream.pos == openSize || /\W/.test(stream.string.charAt(stream.pos - 1 - openSize))) &&
-               stream.match(new RegExp("^.*" + closeRE.source + "(?=\\W|$)"), false)) {
+    } else if ((!charBefore || /\W/.test(charBefore)) && charAfter && /\S/.test(charAfter) &&
+               stream.match(new RegExp("^.*\\S" + closeRE.source + "(?:\\W|$)"), false)) {
       state[phraseModifier] = true;
       state.mode = Modes.attributes;
     }