Identified issue with bidi binding that is causing the

TODO/_current.md

@@ -39,7 +39,7 @@
 # Config
 
 * Test reset.
-    - Not working, see `config.rs/fallback_reset`.
+    - Not working, see `fallback_reset` and `binding_bidi_set_both`.
     - FallbackConfig loses connection with sources?
         - No amount of updates gets the value, so probably.
     - Sometimes the test works, but due to the fallback loading faster.

tests/config.rs

@@ -390,7 +390,6 @@ fn fallback_reset() {
     if status != ConfigStatus::Loaded {
         panic!("{status}");
     }
-
     assert_eq!("fallback", key.get());
 }
 

zero-ui-core/src/var.rs

@@ -1423,6 +1423,7 @@ pub trait Var<T: VarValue>: IntoVar<T, Var = Self> + AnyVar + Clone {
                 let (_, ots_id) = last_update.load(Relaxed);
                 if update_id != ots_id {
                     // other_to_self did not cause this assign, propagate.
+                    last_update.store((update_id, ots_id), Relaxed);
                     if let Some(value) = map(value) {
                         let _ = other.set(value);
                     }

zero-ui-core/src/var/tests.rs

@@ -415,6 +415,33 @@ mod bindings {
         assert_eq!(1, a.strong_count());
         assert_eq!(1, b.strong_count());
     }
+
+    #[test]
+    fn binding_bidi_set_both() {
+        let mut app = App::minimal().run_headless(false);
+        {
+            // behavior of double assign in same update cycle
+            let a = var(1);
+            a.set(10);
+            a.set(20);
+
+            app.update(false).assert_wait();
+
+            assert_eq!(20, a.get());
+        }
+
+        let a = var(1);
+        let b = var(1);
+
+        a.bind_bidi(&b);
+
+        a.set(10);
+        b.set(20);
+        app.update(false).assert_wait();
+
+        assert_eq!(20, a.get());
+        assert_eq!(20, b.get());
+    }
 }
 
 mod context {