Need reliable mechanism for controlling the dialog's width

Problem/Motivation

The dialog box for creating a new link expands to accommodate the width of the matched link candidates' labels (sometimes wider than the browser window), but the dialog box for viewing an existing link is narrower than our users would prefer, as they are unable to see much of the information about the link easily.

Steps to reproduce

1. add a link
2. select the link
3. click the pencil icon
4. note that only a small portion of the URL is visible

Proposed resolution

Expose a documented mechanism for options on the width of the dialog box. Alternatively, document the classes used for the dialog box. I realize I could inspect the currently-generated HTML and reverse-engineer a CSS solution, but that solution would be fragile without documentation identifying stable class names and where those classes will be applied. I see that there is documentation for an unmaintained version of linkit (without this level of detail), but none for the recommended version.