function selectionMode($trigger) {
		if (!teardropSize) return;

		clearCursorMode();
		selectionActive = true;
		positionEnd();
		positionStart();
		if ($trigger) showMenu($trigger);

		setTimeout(() => {
			editor.selection.on("changeSelection", clearSelectionMode);
			editor.selection.on("changeCursor", clearSelectionMode);
		}, 0);
	}
Shows both teardrops
@param {HTMLElement} $trigger
@returns {void}