Function updateDragPreview

src/handlers/editorFileTab.js:278–302

(clientX, clientY)

}

function updateDragPreview(clientX, clientY) {
	const $target = document.elementFromPoint(clientX, clientY);
	if (
		!$parent.contains($target) ||
		$target === $tab ||
		$tab.contains($target)
	) {
		return;
	}

	const $targetTab = $target.closest(".tile");
	if (!$targetTab) return;

	const rect = $targetTab.getBoundingClientRect();
	const midX = rect.left + rect.width / 2;
	const pointerX = tabLeft + tabWidth / 2;
	const $nextSibling = $targetTab.nextElementSibling;
	const $insertBefore = midX < pointerX ? $nextSibling : $targetTab;

	if ($insertBefore === $tab || $tab.nextElementSibling === $insertBefore)
		return;

	reorderTab($insertBefore);
	didReorder = true;
}

function restoreInitialTabPosition() {
	reorderTab(