ubuntu-app-platform updated to Qt 5.6.2

[Alberto Mardegan]

On 30/01/2017 16:44, Timo Jyrinki wrote:
> ubuntu-calculator-app seems to be broken with the previous stable #22
> too though, with a similar error report. We did notice that too now
> that I read the chat log, but didn't consider for this upgrade as it
> seemed to be the status quo.
> 
> But just in case, and as per Dan's e-mail indicating also a problem in
> some app, I reverted Stable channel back to the #22 and will bump the
> content: field to ubuntu-app-platform2 and version to 2.


Do we have a clear understanding of why this happens? Qt apps are
supposed to be binary compatible against newer releases.
One exception could be if the app itself is shipping some plugins,
because in that case I believe that these plugins are somehow bound to a
specific Qt version.

And I wonder, maybe we should think of a different versioning scheme for
the interface? Otherwise, we should have a documentation page which maps
the snap version numbers to the Qt version contained within them.

Given that Qt is at the core of ubuntu-app-platform and that a change of
the Qt version is something we want all developers to be aware of, maybe
the snap (and the "content" interface field) should contain also an
indication of the Qt version they provide?

Ciao,
  Alberto