Don't double apply a group xobject's bbox.

In `beginGroup` we create a new canvas that is the size of the
bounding box and we translate it to the offset. This means we don't need to
also apply the bounding box during `paintFormXObjectBegin`.

This improves #6961 quite a bit, but it still is missing the indention
in the ruler.

src/core/evaluator.js

@@ -527,7 +527,11 @@ class PartialEvaluator {
       operatorList.addOp(OPS.beginGroup, [groupOptions]);
     }
 
-    operatorList.addOp(OPS.paintFormXObjectBegin, [matrix, bbox]);
+    // If it's a group, a new canvas will be created that is the size of the
+    // bounding box and translated to the correct position so we don't need to
+    // apply the bounding box to it.
+    const args = group ? [matrix, null] : [matrix, bbox];
+    operatorList.addOp(OPS.paintFormXObjectBegin, args);
 
     return this.getOperatorList({
       stream: xobj,

test/test_manifest.json

@@ -5922,7 +5922,7 @@
        "link": false,
        "rounds": 1,
        "lastPage": 1,
-       "type": "load"
+       "type": "eq"
     },
     {  "id": "zero_descent",
        "file": "pdfs/zero_descent.pdf",