Function STB_TEXTEDIT_INSERTCHARS

KBotExt/imgui/imgui_widgets.cpp:3761–3791

	}

	static bool STB_TEXTEDIT_INSERTCHARS(ImGuiInputTextState* obj, int pos, const ImWchar* new_text, int new_text_len)
	{
		const bool is_resizable = (obj->Flags & ImGuiInputTextFlags_CallbackResize) != 0;
		const int text_len = obj->CurLenW;
		IM_ASSERT(pos <= text_len);

		const int new_text_len_utf8 = ImTextCountUtf8BytesFromStr(new_text, new_text + new_text_len);
		if (!is_resizable && (new_text_len_utf8 + obj->CurLenA + 1 > obj->BufCapacityA))
			return false;

		// Grow internal buffer if needed
		if (new_text_len + text_len + 1 > obj->TextW.Size)
		{
			if (!is_resizable)
				return false;
			IM_ASSERT(text_len < obj->TextW.Size);
			obj->TextW.resize(text_len + ImClamp(new_text_len * 4, 32, ImMax(256, new_text_len)) + 1);
		}

		ImWchar* text = obj->TextW.Data;
		if (pos != text_len)
			memmove(text + pos + new_text_len, text + pos, (size_t)(text_len - pos) * sizeof(ImWchar));
		memcpy(text + pos, new_text, (size_t)new_text_len * sizeof(ImWchar));

		obj->Edited = true;
		obj->CurLenW += new_text_len;
		obj->CurLenA += new_text_len_utf8;
		obj->TextW[obj->CurLenW] = '\0';

		return true;
	}

	// We don't use an enum so we can build even with conflicting symbols (if another user of stb_textedit.h leak their STB_TEXTEDIT_K_* symbols)
#define STB_TEXTEDIT_K_LEFT         0x200000 // keyboard input to move cursor left