src/vs/workbench/contrib/terminal/browser/xterm/navigationModeAddon.ts/NavigationModeAddon/focusPreviousPage
class NavigationModeAddon:	focusPreviousPage(): void {
		if (!this._terminal?.buffer.active) {
			return;
		}
		this._navigationModeActiveContextKey.set(true);
		if (this._terminal?.buffer.active.viewportY < this._terminal.rows) {
			this._terminal.scrollToTop();
			this._focusRow(0);
		} else {
			this._terminal.scrollLines(-this._terminal.rows);
			this._focusLine('current');
		}
	}