Editing "hidden" URL block causes adjacent blocks to be revealed

[paxperscientiam]

Here's an interesting bug:

Consider a buffer with this text:

[site1](http://site1.com)
[site2](http://site2.com)
[site3](http://site3.com)

Given the above content and given markdown-mode is configured such that markdown-hide-urls is set to true, removing the closing parenthesis on the first block will cause said block and all subsequent blocks to "open". That is, the URLs will no longer be hidden for blocks that otherwise should be.

This appears to be the case regardless of what other content is on the lines.

[jrblevin]

Interesting. It's a question of how to parse this:

[site1](http://site1.com
[site2](http://site2.com)
[site3](http://site3.com)

If you run it through the Markdown dingus, for example, you get a link with text site1 and URL http://site1.com [site2](http://site2.com. So, the current behavior is probably better than the alternative of gobbling up and hiding the second link automatically. That being said, other implementations will keep the last two links intact, which is perhaps what markdown-mode should do for editing purposes.

[jrblevin]

Well, this part is a bug no question. When the broken link is present, I'm getting a font-lock error:

Error during redisplay: (jit-lock-function 527) signaled (wrong-type-argument number-or-marker-p nil)

[paxperscientiam]

I can confirm that this fix works on my end 👍 💯