Adding a custom link in menu via Customize doesn't trim whitespace.

[donmhico]

Steps to reproduce bug.

1. Click "Customize" on any front-end page.
2. Try to add / edit a Menu and add a Custom Link.

The following behaviour happens.

1. If the URL has a whitespace in front. e.g. https://wp.org/
   • URL field box will have red border and the custom link won't be added.

2. If the URL has a whitespace in the end. e.g. https://wp.org/
   • Custom link will be added but if the menu will have the link https://wp.org/%20

I think it would be best if the URL is trimmed before the checking of URL regex happens.

[donmhico]

See #47723.

[audrasjb]

Moving to 5.2.3: we should handle this ticket alongside #47723

[audrasjb]

Thanks @donmhico
47888.diff works like a charm on my side (see screenshot above).
Good to go :)

[donmhico]

@audrasjb You're welcome. Awesome gif BTW :)

[SergeyBiryukov]

In 45869:

Customizer: Trim whitespace from custom link URLs.

This complements a similar fix for the Menus screen in [45655].

Props donmhico, audrasjb.
Fixes #47888. See #47723.

[SergeyBiryukov]

In 45870:

Customizer: Trim whitespace from custom link URLs.

This complements a similar fix for the Menus screen in [45655].

Props donmhico, audrasjb.
Merges [45869] to the 5.2 branch.
Fixes #47888. See #47723.