frosch opened the ticket and wrote:

1. Setting property 0x15 does not deactivate the old house spec. Instead BuildTownHouse builds replaces the choosen houseid by the overriding houseid, if hs->override is defined. This causes the appearance probability of the old house to be added to the probability of the new house. Also it results in half houses, if the newgrf overrides houses by houses of different size (see attached testgrf by mb).

2. Setting property 0x15 should replace old houses and replace them if they are present. (E.g. when changing newgrfs in game or SE)

So basically HouseOverrideManager should behave like IndustryOverrideManager, and GetHouseType like GetIndustryGfx (i.e. with ID translation).

Attachments

• multi_orig.grf (0.82 KiB)

Reported version: trunk
Operating system: All

This issue was imported from FlySpray: https://bugs.openttd.org/task/2613