Korean Hangul/Hanja keycodes 15/19 aren't working

[voussoir]

Hi, thank you for this excellent piece of software.

I'm having some trouble getting my English/Hangul and Hanja buttons working. According to Microsoft, the keycodes are 0x15 and 0x19.

Constant/Value	Description
VK_HANGUL0x15	IME Hangul mode
VK_HANJA0x19	IME Hanja mode

When I press the buttons on https://keycode.info/ I can see decimal 21 and 25 which is also correct.

But these keycodes in my layout.js aren't working

{
    image: { x: 1050, y: 50 },
    text: { key_code: '15', text: 'A/한', size: 9, bold: false }
},
{
    image: { x: 1100, y: 50 },
    text: { key_code: '19', text: '한자', size: 9, bold: false }
},

Every other key on my keyboard is working perfectly. I would appreciate some help getting these last two working.

Thank you!