Jittering During Window Resize in Direct Render Mode

[RossD20Studios]

Problem Description

AIR SDK 33.1.1.889 Mac OS 10.14.6 Mojave

When the application render mode is set to "Direct" and the user attempts to resize the application window, the graphics inside the window jitter erratically.

The issue does not occur when the render mode is set to "Auto" or "CPU". Also, the issue does not occur in AIR 26 (the version that ships with Adobe Animate CC 2018).

Steps to Reproduce

Create a simple AIR app using Animate with some graphics on the screen. Use the following code to setup the stage for the resizing:

stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;

Observe the behavior shown in my attached video:

https://user-images.githubusercontent.com/1627128/179297729-e97f623f-d5e5-48ac-95b7-9a32f8921464.mp4

Video of expected behavior (no jitter):

https://user-images.githubusercontent.com/1627128/179297803-47255b72-bcf1-40e8-a1e0-54db6edb4119.mp4

Test file:

jitterTest.zip

Known Workarounds

The issue does not occur in AIR 26 (I have not tried testing in other AIR versions). The issue does not occur when render mode is set to something other than "Direct"