mq: warn when applying a patch to somewhere other than tip

hgext/mq.py

@@ -766,6 +766,9 b' class queue:'
     def push(self, repo, patch=None, force=False, list=False,
              mergeq=None):
         wlock = repo.wlock()
+        if repo.dirstate.parents()[0] != repo.lookup("tip"):
+            self.ui.status(_("(working directory not at tip)\n"))
+
         try:
             patch = self.lookup(patch)
             # Suppose our series file is: A B C and the current 'top'

tests/test-mq.out

@@ -332,6 +332,7 b' adding manifests'
 adding file changes
 added 1 changesets with 1 changes to 1 files
 Patch queue now empty
+(working directory not at tip)
 applying bar
 Now at: bar
 diff --git a/bar b/bar
@@ -365,6 +366,7 b' adding manifests'
 adding file changes
 added 1 changesets with 1 changes to 1 files
 Patch queue now empty
+(working directory not at tip)
 applying bar
 Now at: bar
 diff --git a/foo b/bleh