bind can be improved for <textarea>

[torhovland]

I have to do this in order to get the initial value loaded into the textarea:

<textarea @bind(myvar)>@myvar</textarea>

It would be nicer and more consistent with <input> if this would work the same way:

<textarea @bind(myvar)></textarea>

[RyoukoKonpaku]

It should be fixed I guess once PR dotnet/blazor#406 is merged as they're revamping the bind system to be more flexible and powerful.

[SteveSandersonMS]

I think that regardless of dotnet/blazor#406 we'll still need to make a tweak in BrowserRenderer.ts in the tryApplyValueProperty function so that it understands that textarea requires special handling for value (equivalent to how it already does for input and select).

This should be a fairly easy tweak (and doesn't need to wait for dotnet/blazor#406) if anyone's interested in submitting a PR :)

[SteveSandersonMS]

In fact it's super trivial: just add case 'TEXTAREA': right under case 'SELECT':. That should do it.

Then it needs an E2E test in BindTest.cs and we're done 🥇

[RyoukoKonpaku]

@SteveSandersonMS Sounds easy enough xD can I give it a shot?

[SteveSandersonMS]

Resolved in dotnet/blazor#439