SIGSEGV on exit for example_glfw_metal

[mmalex]

Version/Branch of Dear ImGui:

Version: Dear ImGui 1.88 WIP (18725)
Branch: master

Back-end/Renderer/Compiler/OS

Back-ends: imgui_impl_glfw.cpp + imgui_impl_metal.cpp
Compiler: clang-1316.0.21.2.5
Operating System: Mac OS Monterey 12.4

When running the example_glfw_metal example, on quit (whether by clicking to close the window, or pressing Apple-Q), the program 'quits unexpectedly'. The full report including stack trace and imgui about info is attached.
imgui_crash_report.txt

steps to reproduce:
what is the correct FIRST thing to do with an absolutely brand new apple macbook pro? install imgui, of course. steps:

• acquire brand new shiny macbook pro, glory at its M1 shinyness. ponder its expense in a time of global warming.
• endure the new mac onboarding process
• install all automatic updates (to monterey 12.4, at time of writing)
• run clang from the commandline to trigger the dev tools CLI installer
• install homebrew
• brew install glfw
• git clone --recursive imgui (as of about 2 hours before this issue)
• cd examples/example_glfw_metal
• make
• ./example_glfw_metal
• Apple-Q or click the red close button -> observe crash

Note that this does not happen with glfw+opengl2, nor glfw+opengl3.
I havent been able to get the SDL based example compiling yet, it fails to find SDL.h despite having run brew install sdl; Im guessing thats a separate issue though...

[mmalex]

doh, im such a noob, the SDL issue was that you need to install sdl2; TIL. anyway, can now confirm that it doesnt crash on exit with example_sdl_metal.

[warrenm]

This may be addressed by #5365.

[mmalex]

I can confirm that #5365 fixes the issue!

[mmalex]

(I actually think that means you fixed it faster than I could even write the issue. that's... negative response time. faster than light!)

[ocornut]

Merged fix as 7354009, thanks Warren !
And thanks Alex for filling such a careful bug report (Apologies if this felt/was overkill! we get a lot of noise and generally have to ask)