Bug 44034 - ListView rapid scrolling on Win 8.1 results in occasional incorrect cell rendering and leaks
Summary: ListView rapid scrolling on Win 8.1 results in occasional incorrect cell rend...
Status: RESOLVED NOT_ON_ROADMAP
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 2.3.1
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2016-09-06 19:39 UTC by aculliney
Modified: 2017-08-11 01:16 UTC (History)
3 users (show)

Tags: ac
Is this bug a regression?: ---
Last known good build:


Attachments
Shows glitches in the colors of ListView cells (24.28 KB, image/png)
2016-09-06 19:39 UTC, aculliney
Details


Notice (2018-05-24): bugzilla.xamarin.com is now in read-only mode.

Please join us on Visual Studio Developer Community and in the Xamarin and Mono organizations on GitHub to continue tracking issues. Bugzilla will remain available for reference in read-only mode. We will continue to work on open Bugzilla bugs, copy them to the new locations as needed for follow-up, and add the new items under Related Links.

Our sincere thanks to everyone who has contributed on this bug tracker over the years. Thanks also for your understanding as we make these adjustments and improvements for the future.


Please create a new report on Developer Community or GitHub with your current version information, steps to reproduce, and relevant error messages or log files if you are hitting an issue that looks similar to this resolved bug and you do not yet see a matching new report.

Related Links:
Status:
RESOLVED NOT_ON_ROADMAP

Description aculliney 2016-09-06 19:39:19 UTC
Created attachment 17352 [details]
Shows glitches in the colors of ListView cells

We have created a reduced test case project that shows incorrect rendering (and possible leaks) using ListViews with an ItemsSourceProperty binding on Win8.1.

Please see our public repository with the test case : https://bitbucket.org/luminixinc/xamarintest (ListViewsPerfTest branch using the ListViewsPerfTest/ListViewsPerfTest.sln project).

...

Both tests should be done with Windows 8.1 target (Note that UWP also appears to show the same/similar problems).

Test #1 : Enter the ListView test page and witness that some cells do not correctly draw subsequent colors (R,G,B in that order repeating).  Sometimes a color is repeated or skipped.
    - You may need to return to home page and then re-enter the ListView test page to trigger the behavior
    - Scrolling rapidly top-to-bottom appears to be more likely to trigger the erroneous rendering

Test #2 : Build in release mode and start Debug > Performance Profiler...  Choose 'Memory Usage' and start the diagnostics session.  On the ListView page, aggressively scroll the view top-to-bottom and watch the memory grow (despite bounded number of cells).  Witness what appears to be unbounded memory growth despite GC events during scrolling.
    - Returning to the home page and re-entering ListView test page once does not appear to clear the allocated memory
    - However returning to the home page and re-entering the ListView test page 'a few more times' does appear to clear a significant portion of the allocated memory, but does not appear to clear *all* of it

...

PullReq improvements/fixes to this test case are most welcome, thanks!
Comment 1 David Ortinau [MSFT] 2017-08-11 01:16:14 UTC
WP8 and 8.1 have been deprecated and as such this work is no longer on our roadmap.