Split link dest from link reference, more explicit

Still fails, though. cc @aroben

Author: mtodd

app/assets/javascripts/task_list.coffee

@@ -125,10 +125,20 @@ itemPattern = ///
     #{escapePattern(complete)}|
     #{escapePattern(incomplete)}
   )
-  (?!                     # is not a link
-    \s*                   # with optional whitespace
-    (?:\(.*?\)|\[.*?\])   # because of destination or reference
+  (?!                     # but not a link to this destination
+    \s*
+    \(.*?\)
   )
+  (?=                     # and not part of a link reference
+    \s*
+    (?:(?:\[.*?\]\s*){2})*
+    (?:[^\[]|$)
+  )
+  # (?!                     # is not a link
+  #   \s*                   # with optional whitespace
+  #   (?:\(.*?\)|\[.*?\])   # because of destination or reference
+  #   (?:\s*[^\[\(])        # but itself not first part of a link
+  # )
   (?=\s)                  # is followed by whitespace
 ///