--css-prefix option no longer adds a hyphen to its built classes

[petdance]

Given this file:

<h1>example</h1>
Here's some <font color="#0000FF">blue</font>
And here's some <font color="RED">red<font>
<p></P>

The behavior of assigning classes in 5.7.17 is not the same as in 5.6.0. I don't know if this is a bug or intentional.

Under 5.6.0:

$ tidy --version
HTML Tidy for Linux version 5.6.0
$ tidy -q --css-prefix foo --clean 1  foo.html 2>&1 | grep span
 span.foo-2 {color: red}
 span.foo-1 {color: #0000FF}
Here's some <span class="foo-1">blue</span> And here's some
<span class="foo-2">red </span>

Under 5.7.17:

$ tidy --version
HTML Tidy for Linux version 5.7.17
$ tidy -q --css-prefix foo --clean 1  foo.html 2>&1 | grep span
 span.foo2 {color: red}
 span.foo1 {color: #0000FF}
Here's some <span class="foo1">blue</span> And here's some
<span class="foo2">red </span>

So now it makes "foo1" instead of "foo-1" as a class name. Is that intentional? When did it get changed? This affects one of my tests in HTML::Tidy5, which pass under 5.6.0 and no longer pass under 5.7.17.

[geoffmcl]

@petdance it is intentional I guess... it got change in #679, part of commit ea4ae0d, where I wrote -

In summary, as far as I can tell the removal of the auto addition of a - character is cosmetic only. 
If a user really wants it back then they can add it to the css-prefix "d-" option...

If it is in a test, then I guess the results must be adjusted according to the version, or the difference accounted for in some other way... sorry...

[petdance]

I'm not complaining, and I know how to fix my tests. I just wanted to bring it to your attention because I couldn't tell if it was an intentional, since I don't have a list of changes between 5.6.0 and now, and I didn't see any GH issues when searching for "css-prefix".