From e3bde56311b3ae2392feea9b3f3ff421352c1636 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Mon, 31 May 2021 12:13:20 +0200
Subject: [PATCH] Ensure that the old/new `options` are correctly combined in
 `PartialEvaluator.clone`

---
 src/core/evaluator.js | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index 79591b4ac..51c0c511c 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -229,9 +229,13 @@ class PartialEvaluator {
     return shadow(this, "_pdfFunctionFactory", pdfFunctionFactory);
   }
 
-  clone(newOptions = DefaultPartialEvaluatorOptions) {
+  clone(newOptions = null) {
     const newEvaluator = Object.create(this);
-    newEvaluator.options = newOptions;
+    newEvaluator.options = Object.assign(
+      Object.create(null),
+      this.options,
+      newOptions
+    );
     return newEvaluator;
   }
 
@@ -3948,9 +3952,7 @@ class TranslatedFont {
     // When parsing Type3 glyphs, always ignore them if there are errors.
     // Compared to the parsing of e.g. an entire page, it doesn't really
     // make sense to only be able to render a Type3 glyph partially.
-    const type3Options = Object.create(evaluator.options);
-    type3Options.ignoreErrors = false;
-    const type3Evaluator = evaluator.clone(type3Options);
+    const type3Evaluator = evaluator.clone({ ignoreErrors: false });
     type3Evaluator.parsingType3Font = true;
 
     const translatedFont = this.font,