Update stats on unit content change

Even when there was no change on checks, changed content could lead to
different state of checks than it was before in case there are more
units with same contentsum within the project.
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/models/unit.py

@@ -667,7 +667,7 @@ class Unit(models.Model):
 
         # Update checks if content or fuzzy flag has changed
         if not same_content or not same_state:
-            self.check(same_state, force_insert)
+            self.check(same_state, same_content, force_insert)
 
         # Update fulltext index if content has changed or this is a new unit
         if force_insert or not same_content:
@@ -847,7 +847,7 @@ class Unit(models.Model):
 
         return (checks_to_run, cleanup_checks)
 
-    def check(self, same_state=True, is_new=False):
+    def check(self, same_state=True, same_content=True, is_new=False):
         '''
         Updates checks for this unit.
         '''
@@ -912,7 +912,7 @@ class Unit(models.Model):
             )
 
         # Update failing checks flag
-        if was_change or is_new:
+        if was_change or is_new or not same_content:
             self.update_has_failing_check(was_change)
 
     def update_has_failing_check(self, recurse=False):