Fix #108501: Image Editor glitch after texture painting undo

When doing the second undo, the image wasn't properly marked for full
update.

There reason was that in some cases the partial_updater was
totally reconstructed: `first_changeset_id` and `last_changeset_id` were both 0.

While the `user_imp->last_changeset_id` was still its last value (e.g., 3).

The fix is to have the partial updater validator to check for the
last change set as well (it was only checking for the first change set).

This way we cover both scenarios when user_imp->last_changeset_id is out
of the range of the partial update history.

Pull Request: https://projects.blender.org/blender/blender/pulls/108533

source/blender/blenkernel/intern/image_partial_update.cc

@@ -419,7 +419,15 @@ struct PartialUpdateRegisterImpl {
    */
   bool can_construct(ChangesetID changeset_id)
   {
-    return changeset_id >= first_changeset_id;
+    if (changeset_id < first_changeset_id) {
+      return false;
+    }
+
+    if (changeset_id > last_changeset_id) {
+      return false;
+    }
+
+    return true;
   }
 
   /**