PR #5138 had the unintended side-effect of drawing all disabled tabs, stemming from the assumption that !widget_is_disabled would be identical to widget_is_enabled.
I have reverted commit 4b91d92 to follow the original logic more closely, adding an exception for disabled tabs made explicitly visible through a sprite.
The tab PR has been much more involved than I'd originally anticipated. Hopefully, a new widget system will eventually make these things easier.
Source directory structure
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audio
Contains files for mixing and playing music and sound.
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drawing
Low level drawing logic and palette tables.
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interface
Window and widget logic, includes high level drawing and input.
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localisation
String IDs, currency and date logic.
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network
Network and multiplayer logic, includes management of network games and downloading / uploading of content.
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management
Park management logic such as finance, marketing and research.
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peep
Guest and staff definitions and logic such as action management and pathfinding.
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platform
Compiler and operating system specific code such as type definitions, message handling and file input / output.
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ride
Data and logic for rides, vehicles and track.
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util
Utility and helper functions.
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windows
Definitions and logic for all the windows in the game.
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world
World objects and mechanics such as the climate, landscape, sprites and park.