Twenty Fourteen: Add gradient background options that fit the theme color scheme

[ianbelanger]

Now that we have the option for certain blocks to have gradient backgrounds, we need to add gradient background options to the theme that fit the themes color scheme.

Add gradient background options (Twenty Fourteen)
Trac ticket: https://core.trac.wordpress.org/ticket/49761

[adeltahri]

I submitted a PR for the ticket.

[karlijnbk]

Hi! I've tested the PR and the colours look really good, but I might have found one possible problem.

On trunk, when you change the button color to a gradient option, it immediately adds a gradient to the button color. On the PR however, the color is solid and only changes to gradient when I, for example, change the angle.

See the two recordings below for clarification.
Trunk: ​https://www.loom.com/share/5a4a54d73aad4137a94fcd1c3f4c4fdf
PR: ​https://www.loom.com/share/3875577390de409aa909e0e9d262fd2d

[karlijnbk]

Theme colors and new theme gradient colors

[karlijnbk]

Gradient colors on buttons

[devmuhib]

Theme default gradients added. I am using latest twenty fourteen theme to test the feature. It's updated.

[karmatosed]

Reading this ticket it looks like close was added potentially as a mistake because this does have a patch. I am therefore going to remove for now that keyword. It can be re-added.

[karmatosed]

After some conversations and considerations I am going to add back the word close. This does absolutely fall into a candidate for closing due to a few things:

• Default themes are currently being focused on for bugs, not enhancements.
• The approach for gradients has changed from a few years ago so a different method would be needed across all default themes.

Along with this the desire to do this doesn't seem sure yet. That said, there is opportunity for feedback and the keyword gives that space. Thank you everyone for your collaboration so far.

[karmatosed]

I am going to close this as it was discussed in Slack, along with other tickets around gradients. I am closing them all together after having left them open for a few days with the close keyword for feedback. Thank you everyone for your collaboration.