efd2e762f7
Give the `IDWALK_CB_…` enum an explicit name: `LibraryForeachIDCallbackFlag`. This way the flags are type-safe, and it's known where values come from. This is much preferred (at least by me) to just having `int flags`. Uses of `0` have been replaced with `IDWALK_CB_NOP` as that has the same value and is of the right type. One invalid use of `IDWALK_NOP` was detected by this change, and is replaced by `IDWALK_CB_NOP`. This change might be incomplete; I gave the enum a name, fixed the compiler errors, and then also updated assignments like `int cb_flag = cb_data->cb_flag`. I might have missed some assignments to `int` though. No functional changes. Pull Request: https://projects.blender.org/blender/blender/pulls/131865
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