If text area was bigger than the post, switching to preview mode
showed gray space under the text. Now the preview pane's background
should fill the whole edit box size.
In e464e69 I removed href='#' but I noticed that it broke some things.
Readding href serves two purposes:
- it makes links reachable with Tab key
- it makes links clickable with Enter key
The alternative to this approach was to introduce [tabindex] and [role]
attributes. But not only using tabindex=0 with <a/> is questionable,
it'd require adding a keyboard handler that'd intercept space and return
key presses and simulated link clicks. Since it's best to leave this
kind of thing to the native UI, I went with readding hrefs instead. I
believe that hash hrefs, even though being a common practice, are silly,
so I decided to settle down with empty hrefs.
As a bonus, I added a snippet that prevents middle mouse clicks from
opening such links/buttons in new tabs, which was the motivation for
e464e69.
