spaming ctrl with = or - triggers native browser zoom event

[achenPDFTron]

Steps to reproduce:

1. use hotkey manager to set up hot keys for "ctrl+=" and "ctrl+-"
2. in the application, hold "ctrl" and rapidly alternate between "=" and "-"

Observe: the native browser zoom event is triggered

Somehow this issue can't be reproduced in the demo.

Workaround for now:

window.addEventListener('keydown', e => {
  if (e.ctrlKey) {
    if (e.which === 187 || e.which === 189) {
      e.preventDefault();
    }
  }
});

[jaywcjlove]

@achenPDFTron thx! I research your solution.

[achenPDFTron]

@jaywcjlove Thanks for taking the time to look into this problem.

[hamidb80]

i just found the solution! you should write:

hotkeys('ctrl+=', kv => {
   kv.preventDefault()
   ....
})