[bugfix] extract linktrail for hr-wiki

Replace r'\p{L}' pattern to r'[^\W\d_]'
unless we sometime have regex package mandatory with Pywikibot

Bug: T378787
Change-Id: I6247df4a4052e3376b159151c77bcafd701660de

Author: xqt

pywikibot/site/_apisite.py

@@ -872,6 +872,9 @@ def linktrail(self) -> str:
         if linktrail == '/^()(.*)$/sD':  # empty linktrail
             return ''
 
+        # T378787
+        linktrail = linktrail.replace(r'\p{L}', r'[^\W\d_]')
+
         match = re.search(r'\((?:\:\?|\?\:)?\[(?P<pattern>.+?)\]'
                           r'(?P<letters>(\|.)*)\)?\+\)', linktrail)
         if not match:

tests/site_tests.py

@@ -1015,7 +1015,8 @@ def test_has_linktrail(self):
         small_wikis = self.site.family.languages_by_size[-size:]
         great_wikis = self.site.family.languages_by_size[:-size]
         great_wikis = random.sample(great_wikis, size)
-        for code in sorted(small_wikis + great_wikis):
+        # Also test for 'hr' which failed due to T378787
+        for code in {'hr', *small_wikis, *great_wikis}:
             site = pywikibot.Site(code, self.family)
             with self.subTest(site=site):
                 self.assertIsInstance(site.linktrail(), str)