Handles ERB-tag inside HTML tags

```erb
<div <%= "class='foo'" %>>
  <p>hello</p>
</div>
```

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 
 ## [Unreleased]
 
+- Handle ERB-tags inside HTML-tags, like `<div <%= "class='foo'" %>>`
+
 ## [0.10.4] - 2023-08-28
 
 - Avoid grouping single tags

lib/syntax_tree/erb/parser.rb

@@ -368,10 +368,17 @@ def parse_until_erb(classes:)
  def parse_html_opening_tag
  opening = consume(:open)
  name = consume(:name)
+
  if name.value =~ /\A[@:#]/
  raise ParseError, "Invalid html-tag name #{name}"
  end
- attributes = many { parse_html_attribute }
+
+ attributes =
+ many do
+ atleast do
+ maybe { parse_erb_tag } || maybe { parse_html_attribute }
+ end
+ end
 
  closing =
  atleast do

test/erb_test.rb

@@ -51,6 +51,13 @@ def test_if_and_end_in_same_tag
  assert_formatting(source, expected)
  end
 
+ def test_erb_inside_html_tag
+ source = "<div <% if eeee then \"b\" else c end %>></div>"
+ expected = "<div <% eeee ? \"b\" : c %>></div>\n"
+
+ assert_formatting(source, expected)
+ end
+
  def test_long_if_statement
  source =
  "<%=number_to_percentage(@reports&.first&.stability*100,precision: 1) if @reports&.first&.other&.stronger&.longer %>"