Notice: Action9 in TTDPatch for unknown GRF Features.

[eis_os]

Hello

While Action9 should be able to skip unknown data like Action14 since TTDPatch 2.5 but because of a design problem in the sprite loader it didn't since a long time ago. (2.5 alphas seem to have the problem already ~ 2006)

The sprite loader rejected all unknown sprites even in the stage Action9/7 got resolved.
As TTDPatch introduced new action features, this was mostly unnoticed.

I discussed this problem with Michael Blunck, currently we haven't found a way to hide Action14 for older TTDPatch versions in a successful way. Action 14 is skipped since r2334 in TTDPatch.

Any new additions to newgrf should be allowed since r2350, the loader will accept any "malformed" data and real sprites when resolving the Action9 targets. This means GRFs will get invalid in Stage Init, for more information visit: GrfLoadingStages