mu4e: Only switch context when really necessary.

[magthe]

It's unnecessary to call the leave and enter functions when not really switching context.

This will allow use of destructive functions (.e.g. clearing of caches) in the leave function.

[magthe]

I'm guessing this can be closed with 60192a6, right?

[djcb]

Ah, thanks for this, appreciated.

I solved the same in a slightly different way though (hope you're not offended!), defaulting to not doing anything when new context is the same as the current one, but allow to force it, using a prefix-argument.

Note that this slightly changes mu4e-context-switch interface.

[magthe]

Your way is better :)

[djcb]

Thanks :-) There some customization now, using mu4e-context-policy and mu4e-compose-context-policy.

[magthe]

I had a look at those... I can't seem to get things to work the way I want, I'm always asked about what context I want. I'll have to look into it a bit more before raising any issue for it though :)