[Enhancement] render line breaks in custom column *description* on hover column title

[Z Yin]

Currently, we can create custom columns, and each column has a "description" field, which will appear when hovering the column title.

I added several custom columns in my library, and my descriptions are quite long (several paragraphs), which contain instructions on how to fill values in those columns.

Currently the input field of the description is a small box, which is fine, because I can type my paragraphs in a text editor, then paste into the box. All line breaks are well preserved.

However, those line breaks don't render on hovering the column title - everything is joint into a single line. Usually this isn't an issue because most users' custom descriptions probably don't have line breaks. But for me, I hope I can see my paragraphs.

In css, this would be `whitespace: pre-wrap` or `whitespace: pre-line`.

[Kovid Goyal (kovid)]

Changing the component for this bug.

 assignee cbhaley
 status triaged

[Charles Haley (cbhaley)]

Implemented using white-space:pre-wrap

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.

 status fixreleased