shelve: reduce scope of merge tool config override

shelve: reduce scope of merge tool config override

The config override seems to have a much greater scope than it needed
to. I *think* it's only relevant in the while merging files. The
rebase step also cares about the merge tool, but we seem to be
explicitly passing it to rebase (around line 755).

Differential Revision: https://phab.mercurial-scm.org/D3517

--- a/hgext/shelve.py	Thu May 10 21:43:32 2018 -0400
+++ b/hgext/shelve.py	Mon May 07 16:49:31 2018 -0700
@@ -933,27 +933,27 @@
         # to the original pctx.
 
         activebookmark = _backupactivebookmark(repo)
+        tmpwctx, addedbefore = _commitworkingcopychanges(ui, repo, opts,
+                                                         tmpwctx)
+        repo, shelvectx = _unshelverestorecommit(ui, repo, basename)
+        _checkunshelveuntrackedproblems(ui, repo, shelvectx)
+        branchtorestore = ''
+        if shelvectx.branch() != shelvectx.p1().branch():
+            branchtorestore = shelvectx.branch()
+
+        shelvectx = _rebaserestoredcommit(ui, repo, opts, tr, oldtiprev,
+                                          basename, pctx, tmpwctx,
+                                          shelvectx, branchtorestore,
+                                          activebookmark)
         overrides = {('ui', 'forcemerge'): opts.get('tool', '')}
         with ui.configoverride(overrides, 'unshelve'):
-            tmpwctx, addedbefore = _commitworkingcopychanges(ui, repo, opts,
-                                                             tmpwctx)
-            repo, shelvectx = _unshelverestorecommit(ui, repo, basename)
-            _checkunshelveuntrackedproblems(ui, repo, shelvectx)
-            branchtorestore = ''
-            if shelvectx.branch() != shelvectx.p1().branch():
-                branchtorestore = shelvectx.branch()
+            mergefiles(ui, repo, pctx, shelvectx)
+        restorebranch(ui, repo, branchtorestore)
+        _forgetunknownfiles(repo, shelvectx, addedbefore)
 
-            shelvectx = _rebaserestoredcommit(ui, repo, opts, tr, oldtiprev,
-                                              basename, pctx, tmpwctx,
-                                              shelvectx, branchtorestore,
-                                              activebookmark)
-            mergefiles(ui, repo, pctx, shelvectx)
-            restorebranch(ui, repo, branchtorestore)
-            _forgetunknownfiles(repo, shelvectx, addedbefore)
-
-            shelvedstate.clear(repo)
-            _finishunshelve(repo, oldtiprev, tr, activebookmark)
-            unshelvecleanup(ui, repo, basename, opts)
+        shelvedstate.clear(repo)
+        _finishunshelve(repo, oldtiprev, tr, activebookmark)
+        unshelvecleanup(ui, repo, basename, opts)
     finally:
         if tr:
             tr.release()