PsychoLlama/main.js

## main.js
const { app, BrowserWindow } = require("electron");

async function createWindow() {
  const win = new BrowserWindow({
    width: 600,
    height: 400,
  });

  win.setVisibleOnAllWorkspaces(true, {
    // Transforms process type to `UIElementApplication`.
    visibleOnFullScreen: true,
  });

  await win.loadFile("./plain-window.html");

  // Waits 1s, then transforms process type to `ForegroundApplication`.
  // The timer avoids contention with `dock.hide()` to avoid the same
  // bug demonstrated here.
  app.dock.show();

  return win;
}

app.on("ready", async () => {
  (await createWindow()).close();
  (await createWindow()).close();
  (await createWindow()).close();
  await createWindow();
});

## package.json
{
  "name": "duplicate-dock-icon-repro",
  "productName": "duplicate-dock-icon-repro",
  "description": "My Electron application description",
  "keywords": [],
  "main": "./main.js",
  "version": "1.0.0",
  "author": "Jesse Gibson",
  "scripts": {
    "start": "electron ."
  },
  "dependencies": {},
  "devDependencies": {
    "electron": "23.1.1"
  }
}

## plain-window.html
<!DOCTYPE html>
<html>
    <head>
        <title>Plain Window</title>
    </head>
    <body>
        <p>
            <em>This page intentionally left blank</em>
        </p>
    </body>
</html>
	const { app, BrowserWindow } = require("electron");

	async function createWindow() {
	const win = new BrowserWindow({
	width: 600,
	height: 400,
	});

	win.setVisibleOnAllWorkspaces(true, {
	// Transforms process type to `UIElementApplication`.
	visibleOnFullScreen: true,
	});

	await win.loadFile("./plain-window.html");

	// Waits 1s, then transforms process type to `ForegroundApplication`.
	// The timer avoids contention with `dock.hide()` to avoid the same
	// bug demonstrated here.
	app.dock.show();

	return win;
	}

	app.on("ready", async () => {
	(await createWindow()).close();
	(await createWindow()).close();
	(await createWindow()).close();
	await createWindow();
	});
	{
	"name": "duplicate-dock-icon-repro",
	"productName": "duplicate-dock-icon-repro",
	"description": "My Electron application description",
	"keywords": [],
	"main": "./main.js",
	"version": "1.0.0",
	"author": "Jesse Gibson",
	"scripts": {
	"start": "electron ."
	},
	"dependencies": {},
	"devDependencies": {
	"electron": "23.1.1"
	}
	}
	<!DOCTYPE html>
	<html>
	<head>
	<title>Plain Window</title>
	</head>
	<body>
	<p>
	<em>This page intentionally left blank</em>
	</p>
	</body>
	</html>