[MlMt] URL in Subject -> no fast on-click filter possible

[Michael Nietzold]

### when:

- i have a subject with a url inside:

   `Re: [alanshaw/david] https://david-dm.org is down (#163)`

- when i hoover over the subject the interesting part gets underlined

### what i see:

- when i click at any place there the url is opended


### what i expected

- when i click at any play the one-click-filter should activated (like 
on other subjects without a url)
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