a946244e7e
Use an `std::optional<int>` to return the icon from `getname_anim_fcurve()`. This function is used both to get the name and to get the icon of whatever the F-Curve is animating. Sometimes the animated struct doesn't have an icon though. In some cases we need to know whether it could resolve the RNA path correctly or not, and checking for 'no icon' was not enough because that may be a valid return value. The returned icon is now wrapped in an `std::optional<int>`, and a `std::nullopt` is returned whenever the icon cannot be determined. No functional changes, except in the two places where the icon is actually used. In case of error there is now always a fallback to the struct icon of the animated ID (previously this was only a fallback when the RNA path was there but could not be resolved; now it's also used when the RNA path is empty, for example). Pull Request: https://projects.blender.org/blender/blender/pulls/125666
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