src/vs/workbench/contrib/terminal/browser/terminalInstance.ts/TerminalInstance/_initDimensions
class TerminalInstance:	private _initDimensions(): void {
		// The terminal panel needs to have been created
		if (!this._container) {
			return;
		}

		const computedStyle = window.getComputedStyle(this._container.parentElement!);
		const width = parseInt(computedStyle.getPropertyValue('width').replace('px', ''), 10);
		const height = parseInt(computedStyle.getPropertyValue('height').replace('px', ''), 10);
		this._evaluateColsAndRows(width, height);
	}