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Message #01184
[Bug 1334177] Re: Regression: Performance hit when editing sorted lists
Thanks a lot for confirming! Not sure why the upload didn't mark the bug
as Fix Released, so I'll do it manually.
** Changed in: reminders-app
Status: Triaged => Fix Released
** Changed in: qtdeclarative-opensource-src (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1334177
Title:
Regression: Performance hit when editing sorted lists
Status in Ubuntu Reminders app:
Fix Released
Status in “qtdeclarative-opensource-src” package in Ubuntu:
Fix Released
Bug description:
This is a follow-up from bug 1303746.
After the migration from Qt 5.2.1 to 5.3.0 in utopic, it seems that
this patch was lost, and it did not land upstream until 5.3.1, which
we do not ship yet. Therefore, we've regressed and we're back to the
same bug.
The most visible effect is in the Reminders app, which uses a list
sorted by date to show the existing notes, and that list is
continually being reordered, rendering the application unusable.
[Impact]
Performance regression from Qt 5.2.1 to 5.3.0 in sorted lists, due to lacking a proper way to support layoutChange.
[Test Case]
We first noticed this after the migration to 5.3.0 in utopic and using the Reminders app: in summary, when editing a note the application becomes unresponsive on the phone and the CPU goes to 100% on the desktop (there it's not too noticeable).
From the upstream bug, my understanding is that the fix landed after
Qt 5.2.1 was released and it made it to 5.3.1, but not 5.3.0, which is
what we currently ship in Ubuntu.
https://bugreports.qt-project.org/browse/QTBUG-37983
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References