fix: harden split/move logic

#2209

Author: dummdidumm

packages/svelte2tsx/src/htmlxtojsx_v2/utils/node-utils.ts

@@ -82,9 +82,14 @@ export function transform(
     }
 
     let removeStart = start;
-    for (const transformation of [...moves].sort((t1, t2) => t1[0] - t2[0])) {
+    const sortedMoves = [...moves].sort((t1, t2) => t1[0] - t2[0]);
+    for (const transformation of sortedMoves) {
         if (removeStart < transformation[0]) {
-            if (deletePos !== moves.length && removeStart > deleteDest) {
+            if (
+                deletePos !== moves.length &&
+                removeStart > deleteDest &&
+                !(removeStart < end && transformation[0] >= end)
+            ) {
                 str.move(removeStart, transformation[0], end);
             }
             if (transformation[0] < end) {
@@ -98,7 +103,8 @@ export function transform(
     if (removeStart > end) {
         // Reset the end to the last transformation before the end if there were transformations after the end
         // so we still delete the correct range afterwards
-        removeStart = moves.find((m) => m[1] < end)?.[1] ?? end;
+        let idx = sortedMoves.findIndex((m) => m[0] > end) - 1;
+        removeStart = sortedMoves[idx]?.[1] ?? end;
     }
 
     if (removeStart < end) {

packages/svelte2tsx/test/htmlx2jsx/samples/snippet.skip/expectedv2.js

@@ -10,4 +10,10 @@ return __sveltets_2_any(0)}
 	return __sveltets_2_any(0)},}});
 	 { svelteHTML.createElement("div", {});asd; }
 
- Component}
+ Component}
+
+ { const $$_tsiL0C = __sveltets_2_ensureComponent(List); new $$_tsiL0C({ target: __sveltets_2_any(), props: { "data":[1, 2, 3],row:(item) => {
+		item;
+	return __sveltets_2_any(0)},}});
+	
+ List}

packages/svelte2tsx/test/htmlx2jsx/samples/snippet.skip/input.svelte

@@ -10,4 +10,10 @@
 	{#snippet bar(x)}
 		<div>asd{x}</div>
 	{/snippet}
-</Component>
+</Component>
+
+<List data={[1, 2, 3]}>
+	{#snippet row(item)}
+		{item}
+	{/snippet}
+</List>