In villager farm the villagers don't mate

Cannot confirm.
Probably your "houses" don't count as houses because there is not enough sky visible at one side of the door or not enough "no sky" at the other side.
Try to build the houses a bit more conventional.

is a bug because the same map opened at minecraft 1.7.2 works

Please attach a ZIP or 7Z of the affected world.

I want to do a market of villagers

I can confirm that either the house detection has changed or the villager breeding is broken somehow...

I have an artificial village with 2 villagers cured from zombie villagers and like 50 "houses" as they worked before. Nothing.

I found a natural village with around 7-10 houses (so a pretty big one)... All but 2 died due to zombie attacks and even though I added more doors... nothing...

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.

Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.

Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.