In #2761 I introduced a new API, struct Mailbox *ctx_mailbox(struct Context* ctx), which has the sole purpose to avoid boilerplate like if (Context && Context->mailbox).

I would like to use the API more extensively, whenever Context->mailbox is used. This needs to be done with care as Context is a global variable and its contents might change when calling other functions.

This would

First: is this a bug report? A suggestion? Or asking for help? Bug report/suggestion

Problem description

For a &mut ProgressBar, there are no methods to set its min and max values. The only methods to change their values (min(self, usize), max(self, usize)) take ownership of the ProgressBar, which is not possible if you have a reference.

Workaround: to gain ownership, create a