Allow user to blacklist themes from random selector.

[FranGM]

If user adds themes they don't want to see to ZSH_BLACKLISTED_THEMES they won't be picked by the random theme selector.

Fixes #3704

[apjanke]

If you put the phrase "Fixes #3704" in the main summary of this Pull Request, then it'll set up an auto-close reference to the issue so it's automatically closed when this PR is merged.

[FranGM]

Fair point, thanks!

[r3cgm]

+1 really want this feature. Hope the branch conflicts can be resolved soon.

[ttimasdf]

Is this PR still alive?

[FranGM]

Hi,
My understanding is that this has been superseded by #3743 but that PR also hasn't seen activity in a while.

Not sure how much interest there is in merging this PR now that ZSH_THEME_RANDOM_CANDIDATES offers a whitelist for themes. If there's still interest we could rework this PR to complement the already existing whitelisting.

[liyishuai]

Not sure how much interest there is in merging this PR now that ZSH_THEME_RANDOM_CANDIDATES offers a whitelist for themes. If there's still interest we could rework this PR to complement the already existing whitelisting.

Given the whitelist, I am still interested in this blacklist feature: I am willing to try new themes, except for the few ones that are annoying.

[SeanChao]

Is this PR still active? This is a great featrue ✨👍
It worked fine in my machine.