Well, the thing about reading its own help files are the accessibility
of those files. Ubuntu Natty has -- in the most recent releases --
migrated to WebKitGtk based help. WebKitGtk has recently gotten a bunch
of bug fixes to be more accessible. Similarly, now that those bugs were
fixed, I have recently added the support required to work with
WebKitGtk-based Yelp.

In order for Orca to read WebKitGtk-based Yelp, one must activate caret
navigation via pressing F7. This is a Yelp thing and it is only required
to be done initially. In addition, it is my understanding that those
installing Ubuntu via the accessibility profile will (in subsequent
releases) have this pre-toggled on for them.

Beyond the above, there have been some changes in WebKitGtk that have
been included in WebKitGtk 1.4. Luke has suggested to me that Ubuntu may
or may not be able to incorporate that version this upcoming release. If
you don't, Orca will do a few odd things when presenting help content.
If Ubuntu wants help to be accessible, Ubuntu needs to include WebKitGtk
1.4 -- ideally in the actual release; alternatively as a really easy to
find PPA.

Lastly, this is just a guess, but people needing to read the Help
content most of all are sighted users who are not familiar with screen
readers, but can see the nifty 'Help' button. The majority of our actual
users, I suspect, would prefer the default button to be Preferences
rather than help.

Having said that, I have been known to be wrong. ;-) When questions come
up like this, in which there's no technical reason why we
couldn't/shouldn't make the change, I ask the users on the Orca-list. I
would encourage you to do so. If they all tell me, "Yeah, only a fool
would make the Preferences button the default button," I will change it
upstream. Fair enough?

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https://bugs.launchpad.net/bugs/749700

Title:
  Default button should be "help"

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