ImGuiInputTextFlags_CallbackHistory=1<<7,// Call user function on pressing Up/Down arrows (for history handling)
ImGuiInputTextFlags_CallbackAlways=1<<8,// Call user function every time
ImGuiInputTextFlags_CallbackCharFilter=1<<9// Call user function to filter character. Modify data->EventChar to replace/filter input, or return 1 to discard character.
//ImGuiInputTextFlags_AlignCenter = 1 << 6,
};
// User fill ImGuiIO.KeyMap[] array with indices into the ImGuiIO.KeysDown[512] array