Bug 60371 - iOS 11 ListView Group Header repeats after item removal from other groups
Summary: iOS 11 ListView Group Header repeats after item removal from other groups
Alias: None
Product: Forms
Classification: Xamarin
Component: iOS ()
Version: 2.4.0
Hardware: Macintosh All
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2017-10-25 15:05 UTC by Jeff Zickgraf
Modified: 2017-11-14 00:28 UTC (History)
6 users (show)

Tags: ios 11, listview, group header, ac
Is this bug a regression?: ---
Last known good build:

Solution Example for Grouping Sample Bug (638.18 KB, application/zip)
2017-10-25 15:05 UTC, Jeff Zickgraf
Image showing duplicated group headers (64.73 KB, image/png)
2017-10-25 15:11 UTC, Jeff Zickgraf

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Description Jeff Zickgraf 2017-10-25 15:05:49 UTC
Created attachment 25448 [details]
Solution Example for Grouping Sample Bug

In iOS 11, we are seeing that frequently when removing items from a group that a group header duplicates. We do not see this behavior in iOS 10.

It doesn't happen every time but with the attached sample, I'm able to recreate about 1/2 the time by:

 - removing some items from the list midway through the list
 - then scrolling down near the bottom of the list and removing one or 2 items from the last grouping
 - then removing items from the 2nd to the last grouping until all items are gone from the group
 - removing more group's items continues to duplicate the the group header

To remove items from the list in the sample application, just click the item row to exercise the ItemSelected event which will do a delete of the item in the group.

        private void lstView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
            var item = (VeggieModel)((ListView)sender).SelectedItem;

            var group = grouped.Where(g => g.Contains(item)).FirstOrDefault();
Comment 1 Jeff Zickgraf 2017-10-25 15:11:27 UTC
Created attachment 25449 [details]
Image showing duplicated group headers
Comment 2 Paul DiPietro [MSFT] 2017-10-26 22:35:09 UTC
It seems like I could get it to do what you described on iOS 11 so I'll set this as confirmed until we can get it looked into further.