- Added the ability for users to opt into CSS `TagHelper` selectors in their required attributes by surrounding the value with `[` and `]`. Added operators `^`, `$` and `=`.
- Added tests to cover code paths used when determining CSS selectors.
#684
- Remove a lot of the ugly generic work done in `TagHelperAttributeList`/`ReadOnlyTagHelperAttributeList`.
- Removed error cases where we'd check on addition of `TagHelperAttribute`s that their `name` was not `null`. This was due to the pre-existing `string` indexer for `TagHelperAttributeList`. It no longer sets `TagHelperAttribute`s directly, instead it's `[key] = value` (instead of `[key] = new TagHelperAttribute(...))`.
- Updated tests to account for new immutability/string indexer format.
- Removed copy ctor from `TagHelperAttribute` since its immutability kills the value.
- Changed `ReadOnlyTagHelperAttributeList` to inherit from `ReadOnlyCollection`
#604
Ryan Brandenburg
N. Taylor Mullen