[Feature] Text selector engine normalise whitespaces

[mxschmitt]

In the web people often use  . If they they want to match the example (see below) with a normal whitespace, it would not work since its a non-breaking whitespace.

// @ts-check
const playwright = require("playwright");

(async () => {
  const browser = await playwright.chromium.launch();
  const page = await browser.newPage();
  await page.setContent(`<button>Sign&nbsp;in</button>`)
  console.log(await page.innerText("text=Sign in"))
  await browser.close();
})();

Proposal: Normalise whitespaces before we compare them.