fix(render): the failed-decode tests revisit a size and draw both pictures on the second page (hayro-interpret patch 91)

Tests only: a JPEG 2000 failure kept for one size is still kept after drawing at another, and
the second page draws the picture decoded on the first and the one the first page's allowance
left out, through one cache.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Pq7HyCHD1R3rywQBPCHXZA

crates/render/src/raster/tests/failed_image_decodes.rs

@@ -129,10 +129,11 @@ fn a_picture_that_does_not_decode_is_decoded_once_however_often_it_is_drawn() {
 }
 
 /// A JPEG 2000 picture decodes at a reduced resolution for the size it is drawn at, so its
-/// failure is kept for that size: drawn at two sizes, it is decoded once at each.
+/// failure is kept for that size: drawn at two sizes, it is decoded once at each, also when it
+/// comes back to the first size after the second.
 #[test]
 fn a_picture_that_does_not_decode_is_decoded_once_at_each_size() {
-    let out = draw_five_times_at("J", [20, 20, 20, 10, 10]);
+    let out = draw_five_times_at("J", [20, 20, 10, 10, 20]);
     assert_eq!(out.decodes, 3, "once at each of its two sizes, and the picture after it");
     assert_eq!(out.failures, 5, "every draw reports the failure");
 }
@@ -196,9 +197,10 @@ fn a_picture_left_out_for_the_pages_allowance_draws_on_the_next_page() {
         b"%PDF-1.7\n1 0 obj << /Type /Catalog /Pages 2 0 R >> endobj\n2 0 obj << /Type /Pages /Kids [3 0 R 4 0 R] /Count 2 >> endobj\n".to_vec();
     pdf.extend(page(3, 5));
     pdf.extend(page(4, 6));
-    // The first page spends its allowance on A and has nothing left for B; the second draws B.
+    // The first page spends its allowance on A and has nothing left for B; the second draws A,
+    // decoded already, and then B.
     pdf.extend(content(5, "q 20 0 0 40 0 0 cm /A Do Q q 20 0 0 40 20 0 cm /B Do Q"));
-    pdf.extend(content(6, "q 20 0 0 40 20 0 cm /B Do Q"));
+    pdf.extend(content(6, "q 20 0 0 40 0 0 cm /A Do Q q 20 0 0 40 20 0 cm /B Do Q"));
     pdf.extend(image(7, 1));
     pdf.extend(image(8, 2));
     pdf.extend_from_slice(b"trailer << /Root 1 0 R >>\n%%EOF\n");
@@ -232,6 +234,6 @@ fn a_picture_left_out_for_the_pages_allowance_draws_on_the_next_page() {
     let Ok([first, second]) = <[Drawn; 2]>::try_from(pages(one, 2)) else { panic!("two pages") };
     assert_eq!((black(&first, 10), black(&first, 30)), (true, false), "the first page had enough for A alone");
     assert!(first.1.contains(&RenderWarning::ContentTruncated), "{:?}", first.1);
-    assert!(black(&second, 30), "B, left out of the first page, draws on the second");
+    assert!(black(&second, 10) && black(&second, 30), "A, and B left out of the first page, draw on the second");
     assert!(second.1.is_empty(), "{:?}", second.1);
 }