RFR: 8377924: Inconsistent parsing of XBM files after JDK-8361748

[Alexey Ivanov]

On Fri, 20 Feb 2026 19:49:08 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

> Should we add one with just a bitmap line (no #define lines at all)?

If the file doesn't start with `#define`, the image isn't loaded at all, the decoder isn't invoked.

I'm thinking about covering other scenarios. It would be good to have a comprehensive coverage of all the branches in the decoder.

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PR Comment: https://git.openjdk.org/jdk/pull/29769#issuecomment-3938668295