random lines drawing inside combo box

[leishi-simerics]

Hello,

recently we observed a random line drawing issue when using combo box. It seems completely random. Not always show and not always the same pattern of lines are draw. I lost clues to debug it. Maybe someone already saw similar issues before? Any suggestions for where I should look at it? Thanks!

Untitled.Project.mp4

[ocornut]

Missing too many details and a repro to be able to help you.
You can use the Metrics window to browse draw calls.

[leishi-simerics]

Hi Omar, got it, thanks for your suggestions. So this random lines drawing is never observed? Maybe something wrong on our side when we prepare the data. I will check the draw calls and try to reproduce this with some steps. BTW, we really like imgui and use it in our products. and hopefully my post in this discussion session does not break any rules. Maybe i should move it in to issue session and add more details if we can reproduce it with a single combo box.

[ocornut]

It's either a subtle bug with a custom rendering backend of yours (unlikely imho) or more likely you have custom rendering code that's doing something not nice (e.g. memory stomping into vertices it doesn't own).

Normally you should be posting in Issue indeed. Narrowing it down to an issue with a repro would be indeed desirable and my assumption is that doing so you will solve your own issue.

Please note that version 1.79 is more than four years old so I wouldn't normally provide support for it.