Customization of imgui causes build error '_FringeScale': is not a member of 'ImDrawList'

[CaptainCMake]

I already had an official copy of the imgui library in my program and when I added imgui-node-editor, I get this build error when my codebase references the official imgui.h:

'_FringeScale': is not a member of 'ImDrawList'

The following commit added _FringeScale to ThirdParty/imgui/imgui.h:
11d2dca

However, I don't see any reference to it in the official imgui repo:
https://github.com/ocornut/imgui

This customization to imgui means I have to use your custom version of imgui throughout my codebase. Even when I built imgui-node-editor, other libraries in my codebase would reference the official imgui.h, which doesn't have _FringeScale. I suggest contributing this change and any other customizations to the imgui project and only consume them once they are merged to master.

If you really want a custom imgui, please rename the source and the public interfaces so that it can coexist with the official imgui library.

[thedmd]

I made use of _FringeScale optional. What it does it allow anti-aliased geometry look sharp when zoomed in (or out). Extension is available here feature/draw-list-fringe-scale. I do have plan to propose this as a PR, or at least start discussion about it on official ImGui repo.

I'm aiming to use vanilla copy of ImGui. Last month I made changes that made this goal viable.

Node Editor depends also from feature/extra-keys, PR is in the queue. Omar is busy at the moment, so there is not way to tell when things will move forward.
I also made similar change to make use of extra key optional. At this point node editor should work with vanilla ImGui copy. As a drawback 'F' (zoom to content) and duplicate action will never be invoked.

[thedmd]

I tested changes on vanilla copy of ImGui and node editor compile fine without errors.

You can now use node editor with your local copy of ImGui. ⚡

As a note, project had cleanup recently:

• Node Editor is now completely contained inside NodeEditor directory
• main header was renamed to imgui_node_editor.h
• picojson is gone

Please let me know if you need anything.