[buddypress-trac] [BuddyPress Trac] #6680: Activity post form template improvements

[buddypress-trac]

#6680: Activity post form template improvements
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 Reporter:  r-a-y        |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  2.5
Component:  Appearance   |    Version:  1.2
 Severity:  normal       |   Keywords:  has-patch ux-feedback
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 Split from #6569.

 Attached patch is a quick merge of both myself and imath's work from that
 ticket.

 - Moves the "What's new, X" paragraph into the `<textarea>` as a
 placeholder.
 - Adds a "Cancel" button.
 - Various markup changes.
 - `autosize.js` (There's some jumpiness in IE10-11).
 - CSS arrow.

 Here's what it kind of looks like:
 [[Image(http://imgreview.com/i/gVLuT)]]

 (This is a previous GIF; not everything has been tested/ported.)

 We'll use this ticket to make some decisions on the UI workflow.

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Ticket URL: <https://buddypress.trac.wordpress.org/ticket/6680>
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