Wrap Elog plain text inside <p> tag

[wanglin86769]

It seems that the previous PR #3413 affects the behavior of Olog, and the approach is not appropriate. So this PR takes a different approach.

For Elog, there are three kind of encodings as follows,

plain

ELCode

HTML

For HTML encoding, the newline is controlled by the <p> tag and whitespace by  , so there is no problem when displayed on Olog UI.

For plain encoding, this PR wraps the Elog text inside <p style="white-space: pre-wrap;"></p> tag in order to preserve whitespaces.

[shroffk]

@georgweiss can we merge this

[wanglin86769]

I just observed that when editing a log entry with plain text encoding, the <p> tag for wrapping also shows up as follows, which is not expected.

Probably this PR is not a good solution either and I am closing it.

[georgweiss]

Actually embedding HTML in Markdown is OK, and that's why you see the <p> tags in the editor. That said, the "editor" is a plain TextArea component, so it won't process neither HTML or Markdown.