[FIX] web: owl_compatibility: don't call mounted when a rendering is being done

Following commit 637684fb50 which improved
the conditions under which the ComponentWrapper compatibility layer
should trigger owl's `__callMounted` on all the owl children of a Legacy Widget.

One case was forgotten though: when the current component (wherever it is in the hierarchy)
is rendered BUT another rendering has been initiated meanwhile.

In that case, we shouldn't mark the component as mounted. The owl's fiber.complete algorithm
will take care of calling __callMounted when it finishes.

closes odoo/odoo#76281

X-original-commit: 7ca2adb1d946590df0caf3aea135601794851894
Signed-off-by: Simon Genin (ges@odoo) <ges@odoo.com>

addons/web/static/src/legacy/js/owl_compatibility.js

@@ -387,10 +387,17 @@ odoo.define('web.OwlCompatibility', function () {
          */
         on_attach_callback() {
             function recursiveCallMounted(component) {
+                const { status, currentFiber } = component.__owl__;
+
+                if (status === 2 && currentFiber && !currentFiber.isCompleted) {
+                    // the component is rendered but another rendering is being done
+                    // it would be foolish to declare the component and children as mounted
+                    return;
+                }
                 if (
-                    component.__owl__.status !== 2 /* RENDERED */ &&
-                    component.__owl__.status !== 3 /* MOUNTED */ &&
-                    component.__owl__.status !== 4 /* UNMOUNTED */
+                   status !== 2 /* RENDERED */ &&
+                   status !== 3 /* MOUNTED */ &&
+                   status !== 4 /* UNMOUNTED */
                 ) {
                     // Avoid calling mounted on a component that is not even
                     // rendered. Doing otherwise will lead to a crash if a