tests are failing

Ah, core commit 201ae2e35438b7d8f7c831ba8ac33bfc035bbb0a looks like a possible suspect:

$f = (string) $filter->process('<code onerror>&nbsp;', Language::LANGCODE_NOT_SPECIFIED);
$this->assertNoNormalized($f, 'onerror', 'HTML filter should remove empty on* attributes.');
- // Note - this string has a decoded   character.
- $this->assertSame(' ', $f);
+ $this->assertSame(' ', $f);

Ah yes, that commit is 🐛 Upgrade filter system to HTML5 Fixed and there's this:

> The HTML5 normalizer normalizes the non-breaking space character to  , I think this is OK and certainly easier to see when reading HTML output.

Automatically closed - issue fixed for 2 weeks with no activity.