fix: debounce shiny:conditional to fire once per frame

srcts/src/shiny/shinyapp.ts

@@ -155,6 +155,8 @@
 
   $allowReconnect: boolean | "force" = false;
 
+  private _conditionalsUpdateScheduled = false;
+
   constructor() {
     this._init();
   }
@@ -579,6 +581,15 @@
   }
 
   $updateConditionals(): void {
+    if (this._conditionalsUpdateScheduled) return;
+    this._conditionalsUpdateScheduled = true;
+    requestAnimationFrame(() => {
+      this._conditionalsUpdateScheduled = false;
+      this._doUpdateConditionals();
+    });
+  }
+
+  private _doUpdateConditionals(): void {
     // @ts-expect-error; TODO-barret; Could this be transformed into `.trigger(TYPE)`?
     $(document).trigger({
       type: "shiny:conditional",

srcts/types/src/shiny/shinyapp.d.ts

@@ -51,6 +51,7 @@ declare class ShinyApp {
     };
     $nextRequestId: number;
     $allowReconnect: boolean | "force";
+    private _conditionalsUpdateScheduled;
     constructor();
     connect(initialInput: InputValues): void;
     isConnected(): boolean;
@@ -77,6 +78,7 @@ declare class ShinyApp {
     private _narrowScopeComponent;
     private _narrowScope;
     $updateConditionals(): void;
+    private _doUpdateConditionals;
     dispatchMessage(data: ArrayBufferLike | string): Promise<void>;
     private _sendMessagesToHandlers;
     private _updateProgress;