Bug 52430 - ListView with HasUnevenRows doesn't auto fit to Image created with ImageSource.FromStream
Summary: ListView with HasUnevenRows doesn't auto fit to Image created with ImageSourc...
Alias: None
Product: Forms
Classification: Xamarin
Component: iOS ()
Version: 2.3.4
Hardware: PC Windows
: High normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2017-02-10 02:38 UTC by Don Becker
Modified: 2017-11-14 00:25 UTC (History)
6 users (show)

Tags: bug, ios, listview, imagesource stream, row height, ac
Is this bug a regression?: ---
Last known good build:

repro project (446.83 KB, application/zip)
2017-03-21 17:04 UTC, Jimmy [MSFT]

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Description Don Becker 2017-02-10 02:38:09 UTC
When displaying an Image created with ImageSource.FromStream in a ListView with HasUnevenRows set to True, the row for the Image is not properly sized until I pull down on the list to refresh it.  The bottom border for the list item is rendered over the Image, and the Image content is overflowed off the screen, but you are not able to scroll to it.  Images displayed by using ImageSource.FromFile are displayed fine.  This only seems to be an issue on iOS for me.  I have created a project that takes a picture, and adds the results to a ListView using either FromFile or FromStream depending on what button is pressed to take the picture.

Comment 1 Jimmy [MSFT] 2017-03-21 17:04:04 UTC
Created attachment 20531 [details]
repro project

Thank you for filing this report! I was able to reproduce the issue described with the sample project linked to in the description. I am confirming this report so the team can investigate further.

This is occurring on iOS and with both RetainElement and RecycleElement. I tested with the following versions of Forms:    BAD
2.3.4-pre5          BAD           BAD

I am also attaching a modified version of the sample project to the report that removes the dependency on the media plugin and PCLStorage packages, and demonstrates that the issue does _not_ happen on Android.

### Steps to Reproduce
1. Run the attached iOS project
2. Press "FromStream() Demo"

### Expected Results
The images in each cell are fully visible. From the first page, press "FromFile() Demo" to see this result.

### Actual Results
The row heights do not expand so the images are cut off or blocked by the image in the following row.
Comment 2 David Ortinau [MSFT] 2017-06-17 22:04:59 UTC
Confirmed this is still the case on nightly
Comment 3 cjw1115@hotmail.com 2017-10-24 08:30:25 UTC
it's a bug about ListViewRenderer.
When I install Xamarin.Forms2.3.4,everything is ok.But when I install Xamarin.Fomrs2.4.0,the app will be crash when the itemsource changed frequently.
And I have made a git diff between 2.3.4 and 2.4.0 version about ListViewRenderer.cs,I found that the renderer is almost refactor.