Move the loadPDFBug function into `PDFViewerApplication._parseHashP…

…arams`

Given that this is a debug-only function we don't need to define it "globally" in the `web/app.js` file.

web/app.js

@@ -265,6 +265,18 @@ const PDFViewerApplication = {
     const { mainContainer, viewerContainer } = this.appConfig,
       params = parseQueryString(hash);
 
+    const loadPDFBug = async () => {
+      if (this._PDFBug) {
+        return;
+      }
+      const { PDFBug } =
+        typeof PDFJSDev === "undefined"
+          ? await import(AppOptions.get("debuggerSrc")) // eslint-disable-line no-unsanitized/method
+          : await __non_webpack_import__(AppOptions.get("debuggerSrc"));
+
+      this._PDFBug = PDFBug;
+    };
+
     if (params.get("disableworker") === "true") {
       try {
         GlobalWorkerOptions.workerSrc ||= AppOptions.get("workerSrc");
@@ -312,7 +324,7 @@ const PDFViewerApplication = {
         case "hover":
           viewerContainer.classList.add(`textLayer-${params.get("textlayer")}`);
           try {
-            await loadPDFBug(this);
+            await loadPDFBug();
             this._PDFBug.loadCSS();
           } catch (ex) {
             console.error(`_parseHashParams: "${ex.message}".`);
@@ -321,12 +333,11 @@ const PDFViewerApplication = {
       }
     }
     if (params.has("pdfbug")) {
-      AppOptions.set("pdfBug", true);
-      AppOptions.set("fontExtraProperties", true);
+      AppOptions.setAll({ pdfBug: true, fontExtraProperties: true });
 
       const enabled = params.get("pdfbug").split(",");
       try {
-        await loadPDFBug(this);
+        await loadPDFBug();
         this._PDFBug.init(mainContainer, enabled);
       } catch (ex) {
         console.error(`_parseHashParams: "${ex.message}".`);
@@ -2170,15 +2181,6 @@ if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
   };
 }
 
-async function loadPDFBug(self) {
-  const { PDFBug } =
-    typeof PDFJSDev === "undefined"
-      ? await import(AppOptions.get("debuggerSrc")) // eslint-disable-line no-unsanitized/method
-      : await __non_webpack_import__(AppOptions.get("debuggerSrc"));
-
-  self._PDFBug = PDFBug;
-}
-
 function webViewerPageRender({ pageNumber }) {
   // If the page is (the most) visible when it starts rendering,
   // ensure that the page number input loading indicator is displayed.