ImFont::IsLoaded() returns false on loaded fonts

[baderouaich]

Version/Branch of Dear ImGui:

Version: 1.79
Branch: master

Back-end/Renderer/Compiler/OS

Back-ends: imgui_impl_opengl3.cpp + imgui_impl_glfw.cpp
Compiler: MSVC v142 Visual Studio 2019 16
Operating System: Windows 10

My Issue/Question:
calling ImFont->IsLoaded() returns false after loading a font successfully.
works ok when not checking for loaded fonts.

Screenshots/Video

Example

void LoadImGuiFonts()
{
	std::unordered_map<Enigma::String, ImFont*> m_fonts;
	static const auto& io = ImGui::GetIO();
	m_fonts["Audiowide-Regular-45"] = io.Fonts->AddFontFromFileTTF(Constants::Resources::Fonts::AUDIOWIDE_FONT_PATH, 45.0f);
	m_fonts["Audiowide-Regular-20"] = io.Fonts->AddFontFromFileTTF(Constants::Resources::Fonts::AUDIOWIDE_FONT_PATH, 20.0f);
	
	m_fonts["Montserrat-Medium-45"] = io.Fonts->AddFontFromFileTTF(Constants::Resources::Fonts::MONTSERRAT_FONT_PATH, 45.0f);
	m_fonts["Montserrat-Medium-20"] = io.Fonts->AddFontFromFileTTF(Constants::Resources::Fonts::MONTSERRAT_FONT_PATH, 20.0f);
	m_fonts["Montserrat-Medium-12"] = io.Fonts->AddFontFromFileTTF(Constants::Resources::Fonts::MONTSERRAT_FONT_PATH, 12.0f);

	// Check if fonts are loaded
	for (const auto& [font_name, font] : m_fonts)
	{
		if (!font->IsLoaded()) // <---- returns false on loaded fonts, works ok when disabled.
		{
			const std::string err_msg = "Failed to load font Resources/Fonts/" + font_name; 
 			std::cerr << err_msg << endl;
			break;

		}
	}
}

[baderouaich]

duplicate of #2311
io.Fonts->Build() has to be called to rebuild the atlas.