Reset transfer functions when entering in a new group

It fixes #20722.

src/core/evaluator.js

@@ -903,6 +903,11 @@ class PartialEvaluator {
     let transferArray;
     if (Array.isArray(tr)) {
       transferArray = tr;
+      if (tr.length > 1 && tr.every(map => map === tr[0])) {
+        // All entries in the array are the same, so we can just use one of
+        // them.
+        transferArray = [tr[0]];
+      }
     } else if (isPDFFunction(tr)) {
       transferArray = [tr];
     } else {

src/display/canvas.js

@@ -2668,6 +2668,7 @@ class CanvasGraphics {
       ["BM", "source-over"],
       ["ca", 1],
       ["CA", 1],
+      ["TR", null],
     ]);
     this.groupStack.push(currentCtx);
     this.groupLevel++;

test/pdfs/issue20722.pdf.link

@@ -0,0 +1 @@
+https://github.com/user-attachments/files/25484709/get1d.pdf

test/test_manifest.json

@@ -13954,5 +13954,15 @@
     "link": true,
     "lastPage": 1,
     "type": "eq"
+  },
+  {
+    "id": "issue20722",
+    "file": "pdfs/issue20722.pdf",
+    "md5": "4a2e58e60973af3004dcfe1ff0be833c",
+    "rounds": 1,
+    "link": true,
+    "firstPage": 171,
+    "lastPage": 171,
+    "type": "eq"
   }
 ]