contacts-query-filter: Remove invalid optimization

The current `QueryFilter` code performs an invalid optimization on
search query updates by assuming a `FilterChange` of
MORE_STRICT/LESS_STRICT when it should be DIFFERENT:

- If the search string is extended, fewer contacts qualify for matching,
  but some might start to pass the threshold.
- If the search string is shrunk, more contacts qualify for matching,
  but some might no longer pass the threshold.

1 files changed, 0 insertions, 11 deletions

diff --git a/src/contacts-query-filter.vala b/src/contacts-query-filter.vala
index 81cae41..a56651c 100644
--- a/src/contacts-query-filter.vala
+++ b/src/contacts-query-filter.vala
@@ -74,17 +74,6 @@ public class Contacts.QueryFilter : Gtk.Filter {
         // We shouldn't get a notify for this but in reality we do, so ignore it
         if (this.query_string == old_query_str)
           return;
-
-        if (this.query_string.length > old_query_str.length &&
-            this.query_string.index_of (old_query_str) != -1) {
-          this.changed (Gtk.FilterChange.MORE_STRICT);
-          return;
-        }
-        if (this.query_string.length < old_query_str.length &&
-            old_query_str.index_of (this.query_string) != -1) {
-          this.changed (Gtk.FilterChange.LESS_STRICT);
-          return;
-        }
       }
     }