[quality]: 'Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true' warning when opening new terminal

[kittaakos]

Bug Description:

I see the following warning when I open a new terminal:

Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently

Steps to Reproduce:

1. Open a new terminal

open_terminal.mp4

Upstream: xtermjs/xterm.js#4260 (comment)
Related: #12691 and #12870

Additional Information

• Operating System: macOS 13.5.2
• Theia Version: 1.41.0