Doug Bunting 37850b5d85 Add `TagHelperOutput.GetChildContentAsync()` overloads including an `HtmlEncoder` ... - #643 part 1 - change is viral and requires an update to `RazorPage.StartTagHelperWritingScope()` - memoize `GetChildContentAsync()` per-encoder - update generation tests to match and to test new behaviour - note `HtmlEncoder`s used elsewhere e.g. in other `RazorPage` instances are unaffected Add `NullHtmlEncoder` Nits: - generally clean up affected doc comments and make them more consistent - remove unused `using`s in files I had open		2016-01-17 22:34:19 -08:00
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Output	Add `TagHelperOutput.GetChildContentAsync()` overloads including an `HtmlEncoder`	2016-01-17 22:34:19 -08:00
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