Customizer - Widgets - Discoverability of Move Up/Down controls

[GrahamArmfield]

Tested with NVDA on FF30 and JAWS on IE10, on Windows 7 64 bit.

To recreate:

• Start your screen reader
• Tab into Customize > Widgets
• Tab to sidebar that has widgets within it and press Enter to open.
• Tab to the Reorder button and press Enter.

There is no audible feedback at this point as focus remains on the Reorder button, although the text has now changed to 'Done'

My suggestion here is that when the Reorder button is actioned that focus is transferred to the first Move control within this particular area. Screen readers will announce the purpose and user can make changes they require.

[GrahamArmfield]

Screenshot showing suggested move of focus when Reorder button is actioned.

[SergeyBiryukov]

In 29242:

Customizer: When widget reorder button is actioned, transfer focus to the first Move control within the section.

fixes #28891.