Allow multiple instances of ImGui

[jordiexvision]

Added some fixes to allow multiple instances of ImGui in the same application. For example, when opening several instances of the same application in different windows.
The current code works for me, but not sure if I'm breaking things here.
Please check.

Thank you for the addon!

ocornut/imgui#586

[moebiussurfing]

hey @jordiexvision , this is working now?
I am looking for the same thing, to use more than one instance in some classes...

EDIT: I tested the PR branch but is getting some conflicts with theme/styling

[moebiussurfing]

hey @jordiexvision, just in case you still needing this:
I got it work with this branch:
#91

[moebiussurfing]

Added some fixes to allow multiple instances of ImGui in the same application. For example, when opening several instances of the same application in different windows.
The current code works for me, but not sure if I'm breaking things here.
Please check.

Thank you for the addon!

ocornut/imgui#586

hey @jordiexvision ,
are you using this updates into the up to date repo?
I am having crashes on exit when using more than one instance.
I think this is really helpful

[Daandelange]

I'm closing this PR as it's been supported in the develop branch for a while. ;)