Wrong indent rule for tag <transition>

[byzf]

Reproduction:
Start with a new buffer, set ft=vue, insert following:

<transition>
<router-view></router-view>
</transition>

Select and type ==

Expected behaviour:

<transition>
    <router-view></router-view>
</transition>

Actual behaviour:

<transition>
<router-view></router-view>
</transition>

Description:
"<transition>" is invalid in html5, Maybe need a option to add custom tagnames in vue, or use xml indent rule instead, as vue documentation allow that use PascalCase in single file components.

[adriaanzon]

XML indentation sounds like a good idea since that would also correctly indent self-closing tags.

[adriaanzon]

Unfortunately vim's XML indent script looks at the syntax group of the tags, so it doesn't work with HTML tags.

[nles]

You can use the html_indent_inctags variable to get the indentation of <transition> (or any other custom tag) to work correctly.

One way to do this is to add this to your .vimrc:
let g:html_indent_inctags = "transition"

[adriaanzon]

We could add transition and other vue-specific tags to b:html_indent_inctags, although this issue will then still exist for any custom component name.