ImGui fonts not working about magnum-integration HOT 2 CLOSED

Thank you! I looked at the example to fix it. The problem that I occurred is that I didn't know I could create an ImGui::Context manually and then pass it to ImGuiIntegration, so this has confused me on how I could add the font in between the two.

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Hi,

the desired usage was calling AddFontFromFileTTF() before instantiating ImGuiIntegration::Context, so it then picks it up as a default font. In order to correctly handle HiDPI rendering, it needs to do some additional setup on the fonts. so if you did that after, there already was a default font and it didn't expect any further changes.

In d774aeb I made it possible to make font changes after ImGuiIntegration::Context is instantiated, but in order to make it pick up the changes correctly and upload an updated glyph cache, you need to explicitly call relayout() after. The docs about font handling were all over the place, so I consolidated them to a single section in 8408dd2, hopefully making everything clearer. Will upload the updated docs later today, I have some other pending edits to make.

Let me know if the above works for you. In case you run into further issues, the ports branch of magnum-examples has a modified imgui example where it loads a font that looks better on HiDPI screens, so you can compare to the code from there.

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