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Created attachment 14383 [details]
Source code that demonstrates issue
On Windows and WinPhone 8.1, changing Image.Source from one image to another of the same size, results in flicker. It appears that although the Source is never null, and the two images being used are the same size, there is a re-draw happening as if the Source is temporarily null. This results in controls that should be to the right of the Image being moved left and then right again, which causes the flicker.
To reproduce, use the attached source file. Create a Windows project. Add two images of the same size to the project, and store in the project folder with Content / Do Not Copy as properties. The images should be called "ic_unchecked_medium.png" and "ic_checked_medium.png" to match the source code.
Run the app, then tap on the image to the left of the text. Each time the image is tapped, the flicker occurs.
Note that there is a similar sounding bug in bugzilla - number 36600, which related to Android. Whilst it sounds similar, I suspect it is different, as the code supplied here does NOT seem to flicker on Android or iOS, only on Windows and WinPhone 8.1 (WinPhone tested in simulator).
Created attachment 14435 [details]
Adding a sample project that reproduces this.
Run the WinApp project on Windows and click on the giant icon that is displayed. It will toggle back and forth between two images and there is a flicker.
Still occurs on 220.127.116.1129
In 18.104.22.16829, now also a problem on Android.
Created attachment 24620 [details]
updated project for android
I'm not able to reproduce a significant flicker. To avoid a new layout cycle on surrounding content, constrain the layout and/or image with a fixed Width/Height.
Tested with 22.214.171.1249-pre2 on Android.
WP is deprecated.
Just to confirm, I've not seen this for quite a while (although don't do WP any more).