Extended action1 allows combining spritesets with different sprite counts in a single action2. NML should support this.
Attached is a patch for the first part.
However, it may be best not to work on this until FS5227 is fixed and backported to 1.2, else NML grfs will become unusable for non-trunk users.
- Target version set to 0.4.0
Can't do this in 0.3 because of OpenTTD compatibility issues
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