[Bug]: Lime 8.3.2, setting fullscreen true on static scenes often results in a black screen until invalidated / re-drawn.

[twilson90]

Preflight Checklist

• I searched existing open and closed issues for duplicates.
• I tested the latest stable Lime release or the current development branch where possible.
• I reduced this to the smallest project or code sample that still reproduces the issue.
• This issue describes one specific behavior, not several unrelated observations.

Problem Description

When I run an app with very little re-drawing and just static display, when I toggle fullscreen to true, there's a chance I see nothing but black, until I do something to prompt a re-draw.
Usually if I just start the app and immediately press alt+enter then I get a black screen first.

A quick and dirty fix is to simply call invalidate() on a DisplayObject on the stage after setting fullscreen=true, which prompts a re-draw.
This feels like a buffer swap/present isn't happening after the fullscreen is toggled.

It is somewhat predictable but not 100%
Usually, if it's presenting black in fullscreen, then I manually trigger a re-draw, then every subsequent fullscreen toggle presents correctly. It does seem to eventually go back to black if I keep toggling though and no further manual re-draws are issued by me.

• fullscreen=true (black)
• move a display object to trigger re-draw (displays correctly)
• fullscreen=false
• fullscreen=true (displays correctly)

Very easy to re-produce in latest Lime release, but much less predictable in dev branch.
I have managed to get it to happen in dev branch so it's still a problem, occurs much less frequently though.

I've attached a log from the sample that shows the sequence of events in a test I conducted but it's not very illustrative of the issue.

Version Information

Lime version: 8.3.2
OpenFL version, if applicable: 9.5.2
Haxe version: 4.3.7
Target/runtime: Hashlink, Windows

Environment

OS: Windows 11
Architecture: x64
GPU/driver, if relevant: Nvidia RTX 2060
Display refresh rate, if relevant: 60

Minimal Reproduction

https://github.com/twilson90/HelloWorld2

Logs and Output

INIT
platformName, Windows
platformVersion, 10.0.26200
Lime, 8.3.2
OpenFl, 9.5.2
-----@477ms-----
[Root invalidated]
-----@477ms-----
maximized, false
size, 800 x 600
position, 560 240
fullscreen, false
-----@2719ms-----
[fullscreen toggled]
-----@2722ms-----
size, 1920 x 1080
position, 0 0
fullscreen, true
[it's all gone black]
-----@4564ms-----
[Root invalidated]
[I can see again now]
-----@6809ms-----
[fullscreen toggled]
-----@6836ms-----
position, 560 240
fullscreen, false
-----@6836ms-----
size, 800 x 600
-----@9001ms-----
position, 2449 235
-----@24881ms-----
[Root invalidated]
-----@26309ms-----
[fullscreen toggled]
-----@26313ms-----
size, 1920 x 1080
position, 1920 0
fullscreen, true
[it's all gone black]
-----@28508ms-----
[fullscreen toggled]
-----@28517ms-----
position, 2449 235
fullscreen, false
-----@28517ms-----
size, 800 x 600
[I can see again now]
-----@29889ms-----
[fullscreen toggled]
-----@29893ms-----
size, 1920 x 1080
position, 1920 0
fullscreen, true
-----@31186ms-----
[Root invalidated]
-----@32237ms-----
[fullscreen toggled]
-----@32246ms-----
position, 2449 235
fullscreen, false
-----@32246ms-----
size, 800 x 600
-----@34317ms-----
position, 2374 239
-----@34930ms-----
size, 1920 x 1009
position, 1920 23
-----@34930ms-----
maximized, true
-----@35875ms-----
[fullscreen toggled]
-----@35880ms-----
size, 1920 x 1080
position, 1920 0
fullscreen, true
-----@35880ms-----
fullscreen, false
[it's all gone black]
-----@38743ms-----
[fullscreen toggled]
-----@38743ms-----
fullscreen, true
[I can see again now]
-----@40539ms-----
[fullscreen toggled]
-----@40548ms-----
position, 1920 23
fullscreen, false
-----@40548ms-----
size, 1920 x 1009
-----@41525ms-----
[fullscreen toggled]
-----@41529ms-----
size, 1920 x 1080
position, 1920 0
fullscreen, true
-----@41529ms-----
fullscreen, false
-----@42234ms-----
[fullscreen toggled]
-----@42243ms-----
fullscreen, true
[it's all gone black]
-----@44964ms-----
[fullscreen toggled]
-----@44971ms-----
size, 1920 x 1009
position, 1920 23
fullscreen, false
[I can see again now]
-----@47864ms-----
size, 800 x 600
position, 2374 239
-----@48748ms-----
[fullscreen toggled]
-----@48751ms-----
size, 1920 x 1080
position, 1920 0
fullscreen, true
[it's all gone black]
-----@50291ms-----
[fullscreen toggled]
-----@50300ms-----
size, 800 x 600
position, 2374 239
fullscreen, false
[I can see again now]
-----@51632ms-----
[fullscreen toggled]
-----@51636ms-----
size, 1920 x 1080
position, 1920 0
fullscreen, true
[it's all gone black]
-----@53668ms-----
[Root invalidated]
[I can see again now]