[$75] Issues with mentions

[sdgun]

When there is '-', '@' or space in the handle names they don't work.
Also if user do backspace after entering a space or '-', it will not show up the list of handles even if user starts typing again.

Screencast.2021-02-24.mp4

[jmgasper]

Challenge https://www.topcoder.com/challenges/cb0730bf-ead2-4f85-b553-7c33b3b96883 has been created for this ticket.

This is an automated message for ghostar via Topcoder X

[jmgasper]

Challenge https://www.topcoder.com/challenges/cb0730bf-ead2-4f85-b553-7c33b3b96883 has been assigned to obog.

This is an automated message for ghostar via Topcoder X

[atelomycterus]

@jmgasper Please apply PR-topcoder-platform/forums-topcoder-editor-plugin#15.

Changes

I've checked on Topcoder sign up page which chars are supported in usernames. Added missing supported chars. Username: letters, numbers and the following characters: "_", ".", "+", "-":

Spaces

Using a space in useranme would cause user to use a reserved/custom keyboard shortcut or use a mouse to cancel the autocompletion mode if they don't want to select. Enter confirms the selection, space (and other chars like ', ' , '(') cancels autocompletion mode.

Using '.', '+'

Using '.', '+' in "/members/autocomplete" (Topocder APIv5):

// custom filter & sort
let regex = new RegExp(`^${query.term}`, `i`);

https://github.com/topcoder-platform/member-api/blob/3474f96ff21e1c36a3964b5ba11acc93554fe9db/docs/swagger.yaml#L573
https://github.com/topcoder-platform/member-api/blob/3474f96ff21e1c36a3964b5ba11acc93554fe9db/src/services/SearchService.js#L138

'.'/'+' is used as any char: