flutter page flickering

[OnClickListener2048]

Sorry for creating a issue which is irrelevant to this repo, but this is the only way i can contact you.
I've been encountered a really tricky problem with flutter, there are few videos that shows the problem are

https://github.com/user-attachments/assets/9ea31592-72b6-4886-91fa-8aae4818d918

it happens sometimes but not always, i've tried that when this flickering shows up i just call setState,and it will go away ,but when i called WidgetsBinding.instance.drawFrame(), it doesn't, since you are a flutter engine developer, can you help me to find out what problem i am facing?

thank you !

[fzyzcjy]

Hi, without more information it is not very easy to determine the root cause. Maybe one way is to firstly print out as much debug information as possible. For example, what is the widget tree? (is the flickering part a single widget or not? I guess no but maybe double check, e.g. is there a hidden overlay there that shows up) Also maybe try to gather more such videos to find patterns (e.g. is the flicker region has some common pattern or is it really random?) Also, if it can be reduced to a minimal reproducible sample then it may be helpful.

[OnClickListener2048]

Hi, without more information it is not very easy to determine the root cause. Maybe one way is to firstly print out as much debug information as possible. For example, what is the widget tree? (is the flickering part a single widget or not? I guess no but maybe double check, e.g. is there a hidden overlay there that shows up) Also maybe try to gather more such videos to find patterns (e.g. is the flicker region has some common pattern or is it really random?) Also, if it can be reduced to a minimal reproducible sample then it may be helpful.

f7e8066b3eba1a146397ee8c66bf343e.mp4

I don't think the flickering part is a widget that invisible or a overlay that hidden in somewhere
what happens in this video happens a lots times and i can' find a pattern about it and when it flickering, the build wasn't called and addPostFrameCallback wasn't called, it looks like the engine mixed up one or two frames, and render it twisted, maybe, do you think could it be that reason?

[fzyzcjy]

Yes I agree that may be somehow an engine issue... More brainstorms:

• Upgrade to latest flutter version since it may contain fixes (which are you using currently btw?)
• Try to disable Impeller rendering engine (or enable it, if you have not), to check whether it only happens in one engine
• Try to enable some logging in flutter, e.g. debugPrintBeginFrameBanner, debugPrintEndFrameBanner (see https://docs.flutter.dev/testing/code-debugging for details)