WebGL: setting matchWebGLToCanvasSize to false and changing to full screen fails

Steps to reproduce:

1. Open the attached project. The project template sets matchWebGLToCanvasSize  to false.
2. Build for web
3. Switch to fullscreeen

Actual results: 
Corrupted canvas image

Expected results: 
Frame rendered normally

Reproducible with versions: 

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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