In addition to this, I would substitute GuiPlatformGetKeyDesc() hexadecimal codes with real defines like VK_OEM_PLUS in Windows or GDKEY(plus) in Linux, and include all GuiPlatformGetKeyDesc() in GetKeyDesc().
For example in Windows version of GuiPlatformGetKeyDesc(), it appears {0x100bb, "[=]"}. However it corresponds to VK_OEM_PLUS that is '+' key.
Mirek, if you want I can propose an implementation.
OK. The only problem: GDK/Win are not the only supported platforms. At least we would need raw X11, ideally also SDL (currently in rainbow) and Turtle.