histedit: add user input to warning message on editing tagged commits

This is a follow-up patch to D5489.

Now, the user will be able to input yes/no(default) on the warning message. Initially, it was the sleep of 1s and histedit window opens. Changes were made as suggested by @mharbison72 and @yuja.

Differential Revision: https://phab.mercurial-scm.org/D5494

hgext/histedit.py

@@ -194,7 +194,6 b' except ImportError:'
 import functools
 import os
 import struct
-import time
 
 from mercurial.i18n import _
 from mercurial import (
@@ -1702,9 +1701,10 b' def _histedit(ui, repo, state, *freeargs'
             if not hastags:
                 hastags = len(tags)
     if hastags:
-        ui.warn(_('warning: tags associated with the given changeset '
-        'will be lost after histedit \n'))
-        time.sleep(1)
+        if ui.promptchoice(_('warning: tags associated with the given'
+            ' changeset will be lost after histedit. \n'
+            'do you want to continue (yN)? $$ &Yes $$ &No'), default=1):
+            raise error.Abort(_('histedit cancelled\n'))
     # rebuild state
     if goal == goalcontinue:
         state.read()