[Impeller] draw order optimizer has latent rendering error with bdfs.

[jonahwilliams]

Running the example app in #154046 (comment) , the draw order optimization causes rendering bugs. To get to the following UI

To create the crash:

Goto Dishes screen
Tap on the image presented (to open a new screen)
Try scrolling the list, this should almost immediately crash the app. At least on my device it does
For step 3, if you wait a few moments to allow the images to load and then scroll you may also notice the polygons before the crash

Note: this doesn't crash anymore but still renders incorrectly.

Working

Broken

The draw order optimization was indirectly reverted by switching from entity pass to exp canvas in flutter/engine#55047

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.