Sybren A. Stüvel
90a27d5aa9
Define enum `eContextResult` and use its values for returns, instead of just returning 1, 0, or -1 (and always having some comment that explains what -1 means). This also cleans up the mixup between returning `0` and `false`, and `1` and `true`. An inconsistency was discovered during this cleanup, and marked with `TODO(sybren)`. It's not fixed here, as it would consititute a functional change. The enum isn't used everywhere, as enums in C and C++ can have different storage sizes. To prevent issues, callback functions are still declared as returning`int`. To at least make things easier to understand for humans, I marked those with `int /*eContextResult*/`. This is a followup of D9090, and is intended to unify how context callbacks return values. This will make it easier to extend the approach in D9090 to those functions. No functional changes. Differential Revision: https://developer.blender.org/D9095
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