src/vs/workbench/contrib/terminal/browser/terminalInstance.ts/TerminalInstance/_initDimensions
class TerminalInstance:	private _initDimensions(): void {
		// The terminal panel needs to have been created to get the real view dimensions
		if (!this._container) {
			// Set the fallback dimensions if not
			this._cols = Constants.DefaultCols;
			this._rows = Constants.DefaultRows;
			return;
		}

		const computedStyle = window.getComputedStyle(this._container);
		const width = parseInt(computedStyle.width);
		const height = parseInt(computedStyle.height);

		this._evaluateColsAndRows(width, height);
	}