Fixed bug with placeholder

[nikelborm]

Bug:

When placeholder is provided and there is no value, placeholder renders fine in the textarea, but it does not render in the preview.

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[jaywcjlove]

@nikelborm This is a function that comes with the html <textarea> tag, and there will be no bugs.
There may be style conflicts.

I tested and there are no bugs

[nikelborm]

Ahah, I found where was the problem

I didn't see the placeholder because my parent component is display:flex and it squeeze code editor

But when I disabled flex it works fine

What should we do with this?
In this flex case I think this manual setting of placeholder will be still usefull

[nikelborm]

Check my last commit with 49e3310#diff-f87270b29523717f9e20dac3310b24d5bf58c893da983f8df0745ae3179c45a0R79

If I remove this placeholder fix from here d305a98#diff-0b5adbfe7b36e4ae2f479291e20152e33e940f7f265162d77f40f6bdb5da7405R65

My test case will look like this

[nikelborm]

With fix enabled it will look like this

[jaywcjlove]

One line short code code, this usage is rare, but it convinced me.
@nikelborm