CSS line-height values should be unitless - widgets.css

[ianbelanger]

As outlined in #44643, CSS line-height values should be unitless unless necessary to be defined as a specific pixel value. It was suggested that we break up 44643 by stylesheet in order to better track them.

This ticket covers wp-admin/css/widgets.css

Note: The patch was tested only on a Windows machine in Chrome, Firefox, IE11 and Edge. As per https://core.trac.wordpress.org/ticket/44643#comment:23 it should probably be tested on other OS's and supported browsers.

[audrasjb]

Patch refresh

[audrasjb]

Thanks for the patch @ianbelanger
Patch tested, now refreshed and ready to go!

[SergeyBiryukov]

In 45053:

CSS Coding Standards: Use unitless values for line-height in wp-admin/css/widgets.css.

Props ianbelanger, audrasjb.
Fixes #46531. See #44643.

[ianbelanger]

Refreshes and updates patch with more precise line-height calculations

[SergeyBiryukov]

In 45415:

CSS Coding Standards: Update unitless values for line-height in wp-admin/css/widgets.css with more precise calculations.

Props ianbelanger.
Fixes #46531.