Special characters: add a search box

[rgreen5]

Your idea

Add a search function to the Special characters window.

See also, #23665.

Problem to be solved

This would make finding characters in the "Musical symbols" and "Unicode symbols" possible. At the moment it is almost impossible to find anything unless it is in the "Common" window, and this limits the usefulness of the SC palette.

Checklist

• [X] This request follows the guidelines for reporting issues
• [X] I have verified that this feature request has not been logged before, by searching the issue tracker for similar requests

[bkunda]

@avvvvve did you already have a design for this?