Upload multiple files with Input element with SendKeys broken after Chrome v75.

[Mark van der werf]

I have an automated test with Selenium in C# which uploads files through an Input element in a drag-and-drop area. 

Since my Chrome was updated to v75 (now v76) this is no longer working well. Everytime a file is uploaded all previously uploaded files are uploaded again, for example when I try to upload 3 files in a row the first file will be uploaded 3 times, the second one 2 times and the last one only once. The intended behaviour is to have each file just once. 

The following code demonstrates the problem: 

using Microsoft.VisualStudio.TestTools.UnitTesting;

using OpenQA.Selenium;

using OpenQA.Selenium.Chrome;

using System;

using System.IO;

using System.Reflection;

namespace UnitTestProject1

{

    [TestClass]

    public class UnitTest1

    {

        [TestMethod]

        public void TestMethod1()

        {

            var driver = new ChromeDriver(Directory.GetCurrentDirectory(), new ChromeOptions());

            driver.Manage().Timeouts().ImplicitWait = TimeSpan.FromSeconds(15);

            driver.Url = "https://gofile.io/?t=uploadFiles";

            var path = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);

            var pdfFile1 = $"{path}\\Files\\Geboorteakte 1.pdf";

            var pdfFile2 = $"{path}\\Files\\Geboorteakte 2.pdf";

            var input = driver.FindElementByXPath("//input[@type='file']");

            input.SendKeys(pdfFile1);

            input = driver.FindElementByXPath("//input[@type='file']");

            input.SendKeys(pdfFile2);

            Assert.AreEqual(2, driver.FindElementsByXPath("//tbody//tr[@role='row']").Count);

        }

    }

}

The pdf's are two random PDFs in a folder called Files in the project folder with 'Copy always'at Copy to Output Directory. 

I'm using Selenium.Chrome.Webdriver 76, Chrome 76 and Selenium.Webdriver 3.141.0 

Instead of 2 uploaded files I'm getting 3 uploaded files, the first file uploaded twice. 

With Selenium.Chrome.Webdriver 74 and Chrome 74 this code worked fine, both files get uploaded once as intended. 

I don't know what is causing the issues since Chrome v 75 and I don't know how to fix it elegantly, can anyone help?

Mark van der Werf