Add support for display: flow-root

[praveenpuglia]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: http://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: http://flight-manual.atom.io/hacking-atom/sections/debugging/
  • Checked the FAQs on the message board for common solutions: https://discuss.atom.io/c/faq
  • Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
  • Checked that there is not already an Atom package that provides the described functionality: https://atom.io/packages

Description

flow-root is a new CSS value that's available for the display property. It should be part of the package to provide autocompletion.

[Alhadis]

Where did you read that?

[thomasjo]

Where did you read that?

https://developer.mozilla.org/en-US/docs/Web/CSS/display

[Alhadis]

Just checking this wasn't another Facebook thing, what with its "Flow" and all.

And the flow-root must've been added to that page recently (as in, since #99).

God only knows what else is missing.

[winstliu]

Value autocompletion is handled by https://github.com/adobe/brackets/blob/master/src/extensions/default/CSSCodeHints/CSSProperties.json. If you would like flow-root and friends to be available for autocompletion, you'll need to submit a PR to that repository.

[praveenpuglia]

@50Wliu So VSCode seems to be using this package. Hence updating at brackets side will help propagate changes everywhere?