Display theme screenshot in network admin

[johnbillion]

The screenshot for each theme should be displayed in a new column on the following list tables:

• Network Admin -> Themes
• Network Admin -> Sites -> Edit -> Themes

[mp518]

Hello @johnbillion,

This is good enhancement and i have created patch for this enhancement also attached screenshot after done this.can you review that patch and if any changes then let me know.

Note:Please ignore 41155.patch attachment because by mistake attached wrong patch.my apologize for that.

Thank You,
Mahesh

[mp518]

Added screenshot image size

[mp518]

Added screenshot new column

[mp518]

Themes Network Admin Theme Sites.png

[mp518]

Edit Site Network Admin Theme

[mp518]

here is diff

[vagios]

Merged both patches and made some fixes.

[vagios]

In 41164.1.patch I merged both patches into one. Also made some fixes,

• Removed globals from column_screenshot documentation. (Also changed @since value)
• Removed fixed width since it looked really bad in some cases and add some basic responsiveness to <img />. I am not sure how the screenshot should be presented but it looks as a good starting point.
• Added alt and title attributes on <img />
• Fixed some spacings in code.

[kakshak]

Hello @johnbillion,
I have merged this patch in my local multi site environment and it's working fine.

[johnbillion]

41164.diff​ is a refreshed patch. I quite like this. Any objections?

[johnbillion]

This still needs work due to width issues on narrow viewports and the horizontal space taken up by the automatic updates column. If someone wants to pick this up and test both screens (Network Admin -> Themes and Network Admin -> Sites -> Edit -> Themes) at small resolutions and with the auto updates column in place, that would be great.