Apple7 Fails msaa-line example

[cwfitzgerald]

Discovered in #8610 (comment)

Honestly the chances of us fixing this one on our own are very slim. This is also a decent chance this is a driver problem.

 stdout ───

    running 1 test
    Starting image comparison test with reference image "wgpu/examples/features/../..//examples/features/src/msaa_line/screenshot.png"
        Mean: 0.138320
        Min Value: 0.000000
              25%: 0.385828
              50%: 0.745967
              75%: 0.926460
              95%: 0.968320
              99%: 0.973254
        Max Value: 0.992531
        Expected Mean (0.138320) to be under expected maximum (0.065): FAIL
        Expected 50% (0.745967) to be under expected maximum (0.29): FAIL
    test [Executed] [Metal/Apple A7 GPU/0] msaa-line ... FAILED

    failures:

    ---- [Executed] [Metal/Apple A7 GPU/0] msaa-line ----
    test panicked: examples\features\src\framework.rs:504:9: test "msaa-line" did not behave as expected


    failures:
        [Executed] [Metal/Apple A7 GPU/0] msaa-line

    test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 32 filtered out; finished in 6.09s

  stderr ───
    [examples\features\src\framework.rs:601:21] "wgpu/examples/features".to_string() + "/../../" + params.image_path = "wgpu/examples/features/../..//examples/features/src/msaa_line/screenshot.png"

    thread '<unnamed>' panicked at C:\Users\User\source\repos\wgpu\tests\src\image.rs:252:9:
    Image data mismatch: wgpu/examples/features/../..//examples/features/src/msaa_line/screenshot-metal-Apple_A7_GPU--difference.png
    note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
    [2025-12-03T16:57:50Z ERROR wgpu_test::expectations] Panic: Image data mismatch: wgpu/examples/features/../..//examples/features/src/msaa_line/screenshot-metal-Apple_A7_GPU--difference.png

    thread '<unnamed>' panicked at tests\src\run.rs:121:9:
    examples\features\src\framework.rs:504:9: test "msaa-line" did not behave as expected