Remove the 'oplist' rendering intent when `getOperatorList` has returned the complete `OperatorList`, and prevent errors in `PDFPageProxy_destroy` for the 'oplist' rendering intent

src/display/api.js

@@ -1034,6 +1034,11 @@ var PDFPageProxy = (function PDFPageProxyClosure() {
       function operatorListChanged() {
         if (intentState.operatorList.lastChunk) {
           intentState.opListReadCapability.resolve(intentState.operatorList);
+
+          var i = intentState.renderTasks.indexOf(opListTask);
+          if (i >= 0) {
+            intentState.renderTasks.splice(i, 1);
+          }
         }
       }
 
@@ -1042,9 +1047,10 @@ var PDFPageProxy = (function PDFPageProxyClosure() {
         this.intentStates[renderingIntent] = Object.create(null);
       }
       var intentState = this.intentStates[renderingIntent];
+      var opListTask;
 
       if (!intentState.opListReadCapability) {
-        var opListTask = {};
+        opListTask = {};
         opListTask.operatorListChanged = operatorListChanged;
         intentState.receivingOperatorList = true;
         intentState.opListReadCapability = createPromiseCapability();
@@ -1087,6 +1093,10 @@ var PDFPageProxy = (function PDFPageProxyClosure() {
 
       var waitOn = [];
       Object.keys(this.intentStates).forEach(function(intent) {
+        if (intent === 'oplist') {
+          // Avoid errors below, since the renderTasks are just stubs.
+          return;
+        }
         var intentState = this.intentStates[intent];
         intentState.renderTasks.forEach(function(renderTask) {
           var renderCompleted = renderTask.capability.promise.