[Bug 1821091] [NEW] [FFe] Qt 5.12.2 update

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Rik Mills (rikmills):

Dear Release Team,

I would like to update Qt in disco from 5.11.3 to 5.12.2.

The reasons are the following:

1) The 5.11 branch is EOL and no longer receiving any fixes. The 5.12
branch is LTS and will be supported for three years.

2) New versions of Plasma are going to require Qt 5.12, and the Kubuntu
team would like to be able to package them in their backports PPA for
disco.

3) In Qt 5.12, the memory usage of the QML Engine is reduced by up to 30
%.

4) Finally we will be able to sync all packages from Debian. I have
managed to drop the delta in qtbase, qtmultimedia and qtwebkit.

Why we haven’t packaged it early: we did not want to package 5.12.1
because it had some known bugs. And 5.12.2 was released upstream later
than it was originally planned.

Changelog: https://wiki.qt.io/New_Features_in_Qt_5.12

The packages are being prepared in https://launchpad.net/~ci-train-ppa-
service/+archive/ubuntu/3680/+packages, but these will be replaced with
syncs from Debian when qtbase and qtdeclarative get accepted from
Debian’s NEW queue.

This transition will require syncs of all Qt packages, and no-change
rebuilds of packages that build-depend on qtbase5-private-dev or
qtdeclarative5-private-dev.

All Qt modules are in universe.

** Affects: qtbase-opensource-src (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: upgrade-software-version
-- 
[FFe] Qt 5.12.2 update
https://bugs.launchpad.net/bugs/1821091
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