CSS line-height values should be unitless - common.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 much of wp-admin/css/common.css, see patch notes below

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

Patch Notes:

Unchanged line-height values that use units (I could not find a good unitless solution that would work across all browsers and admin pages)

line 222 - body
line 509 - .widefat td, .widefat td p, .widefat td ol, .widefat td ul
line 516 - .widefat th, .widefat thead td, .widefat tfoot td
line 759 - .widget .widget-top, .postbox .hndle, .stuffbox .hndle, .control-section .accordion-section-title, .sidebar-name, #nav-menu-header, #nav-menu-footer, .menu-item-handle, .checkbox, .side-info, #your-profile #rich_editing, .widefat thead th, .widefat thead td, .widefat tfoot th, .widefat tfoot td

Unable to find these selectors anywhere in the DOM

line 838 - .key-labels label
line 1739 - .toggle-arrow
line 1769 - #number-of-columns
line 3040 - .bulk-action-notice .toggle-indicator:before

[desrosj]

#38239 was marked as a duplicate.

[talldanwp]

Thanks for your work on this @ianbelanger. I've given this a thorough test and also double-checked the calculations and everything looks good from my point of view.

[pento]

In 45243:

CSS: Remove the units from line-height properties in common.css.

Props ianbelanger, talldanwp.
Fixes #46493.