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How to prevent F keys and other browser shortcuts?

See original GitHub issue

Specification

pywebview version: 3.6.3
operating system: Windows 10
web renderer: Edge

Description

Hi everyone, I am building basic python desktop applications, I use various servers, flask, pywebio, etc. to build my GUI. I want my apps to provide the full desktop experience. On the pywebview window, when I click on F3 or use a shortcut like CTRL+F, edge reveals itself with a search bar. I don’t want it to reveal that it runs in a browser, so I used JavaScript code below but there is a problem, when my page loads slowly and if my server crashes, this JavaScript code won’t work and all the shortcuts and F keys will be active again. Is there another way to prevent browser shortcuts? This method that i use is really sketchy and doesn’t feel good.

let FKeys = [
  112, // F1
  113,
  114, // F3
  115,
  116, // F5 - Refresh
  117,
  118,
  119,
  120,
  121, // F10 - DevTools
  122, // F11 - Fullscreen
  123, // F12 - Dev Tools
];
let ForbiddenShortcutLetters = [
  "c", // Copy
  "v", // Paste
  "x", // Cut
  "s", // Save
  "p", // Print
  "w", // Close
  "u", // View Source
  "a", // Select All
  "z", // Undo
];
let ForbiddenShotcutKeyCodes = [
  73, // I
  69, // E
  74, // J
  70, // F
];
document.addEventListener("contextmenu", function (event) {
  event.preventDefault();
});
document.onkeydown = function (event) {
  console.log(event);
  if (FKeys.includes(event.keyCode)) {
    console.log("F key pressed");
    event.preventDefault();
    event.stopPropagation();
    return false;
  } else if (
    (event.ctrlKey || event.shiftKey || event.altKey) &&
    ForbiddenShortcutLetters.indexOf(event.key) !== -1
  ) {
    event.preventDefault();
    event.stopPropagation();
    return false;
  } else if (
    (event.ctrlKey || event.shiftKey || event.altKey) &&
    ForbiddenShotcutKeyCodes.includes(event.keyCode)
  ) {
    event.preventDefault();
    event.stopPropagation();
    return false;
  } else if (event.ctrlKey) {
    // Disable Ctrl
    event.preventDefault();
    event.stopPropagation();
    return false;
  } else if (event.shiftKey) {
    // Disable Shift
    event.preventDefault();
    event.stopPropagation();
    return false;
  } else if (event.altKey) {
    // Disable Alt
    event.preventDefault();
    event.stopPropagation();
    return false;
  }
};