[Regression] Re-factor the *internal* renderInteractiveForms handling, since it's currently subtly wrong

The value of the `renderInteractiveForms` parameter, as passed to the `PDFPageProxy.render` method, will (potentially) affect the size/content of the operatorList that's returned from the worker (for documents with forms).
Given that operatorLists will generally, unless they contain huge images, be cached in the API, repeated `PDFPageProxy.render` calls that *only* change the `renderInteractiveForms` parameter can thus return an incorrect operatorList.

As far as I can tell, this *subtle* bug has existed ever since `renderInteractiveForms`-support was first added in PR 7633 (which is almost five years ago).
With the previous patch, fixing this is now really simple by "encoding" the `renderInteractiveForms` parameter in the *internal* renderingIntent handling.

src/core/document.js

@@ -320,14 +320,7 @@ class Page {
     });
   }
 
-  getOperatorList({
-    handler,
-    sink,
-    task,
-    intent,
-    renderInteractiveForms,
-    annotationStorage,
-  }) {
+  getOperatorList({ handler, sink, task, intent, annotationStorage }) {
     const contentStreamPromise = this.getContentStream(handler);
     const resourcesPromise = this.loadResources([
       "ColorSpace",
@@ -384,7 +377,8 @@ class Page {
           pageOpList.flush(true);
           return { length: pageOpList.totalLength };
         }
-        const intentAny = !!(intent & RenderingIntentFlag.ANY),
+        const renderForms = !!(intent & RenderingIntentFlag.ANNOTATION_FORMS),
+          intentAny = !!(intent & RenderingIntentFlag.ANY),
           intentDisplay = !!(intent & RenderingIntentFlag.DISPLAY),
           intentPrint = !!(intent & RenderingIntentFlag.PRINT);
 
@@ -402,7 +396,7 @@ class Page {
                 .getOperatorList(
                   partialEvaluator,
                   task,
-                  renderInteractiveForms,
+                  renderForms,
                   annotationStorage
                 )
                 .catch(function (reason) {

src/core/worker.js

@@ -688,7 +688,6 @@ class WorkerMessageHandler {
             sink,
             task,
             intent: data.intent,
-            renderInteractiveForms: data.renderInteractiveForms,
             annotationStorage: data.annotationStorage,
           })
           .then(

src/display/api.js

@@ -515,7 +515,7 @@ function _fetchDocument(worker, source, pdfDataRangeTransport, docId) {
     });
 }
 
-function getRenderingIntent(intent, { isOpList = false }) {
+function getRenderingIntent(intent, { renderForms = false, isOpList = false }) {
   let renderingIntent = RenderingIntentFlag.DISPLAY; // Default value.
   switch (intent) {
     case "any":
@@ -529,6 +529,9 @@ function getRenderingIntent(intent, { isOpList = false }) {
     default:
       warn(`getRenderingIntent - invalid intent: ${intent}`);
   }
+  if (renderForms) {
+    renderingIntent += RenderingIntentFlag.ANNOTATION_FORMS;
+  }
   if (isOpList) {
     renderingIntent += RenderingIntentFlag.OPLIST;
   }
@@ -1356,7 +1359,9 @@ class PDFPageProxy {
       this._stats.time("Overall");
     }
 
-    const renderingIntent = getRenderingIntent(intent, {});
+    const renderingIntent = getRenderingIntent(intent, {
+      renderForms: renderInteractiveForms === true,
+    });
     // If there was a pending destroy, cancel it so no cleanup happens during
     // this call to render.
     this.pendingCleanup = false;
@@ -1400,7 +1405,6 @@ class PDFPageProxy {
       this._pumpOperatorList({
         pageIndex: this._pageIndex,
         intent: renderingIntent,
-        renderInteractiveForms: renderInteractiveForms === true,
         annotationStorage,
       });
     }

src/shared/util.js

@@ -22,6 +22,7 @@ const RenderingIntentFlag = {
   ANY: 0x01,
   DISPLAY: 0x02,
   PRINT: 0x04,
+  ANNOTATION_FORMS: 0x20,
   OPLIST: 0x100,
 };