fix: adjust unknown code warning offset (#11621)

They were the wrong way around
fixes #11612

packages/svelte/src/compiler/phases/2-analyze/index.js

@@ -1110,7 +1110,7 @@ const common_visitors = {
 				if (prev.type === 'Comment') {
 					ignores.push(
 						...extract_svelte_ignore(
-							prev.start + 2 /* '//'.length */,
+							prev.start + 4 /* '<!--'.length */,
 							prev.data,
 							state.analysis.runes
 						)
@@ -1133,7 +1133,7 @@ const common_visitors = {
 				for (const comment of comments) {
 					ignores.push(
 						...extract_svelte_ignore(
-							comment.start + 4 /* '<!--'.length */,
+							comment.start + 2 /* '//'.length */,
 							comment.value,
 							state.analysis.runes
 						)

packages/svelte/tests/validator/samples/unknown-code/warnings.json

@@ -4,11 +4,11 @@
 		"message": "`a11y-missing-attribute` is no longer valid — please use `a11y_missing_attribute` instead",
 		"start": {
 			"line": 3,
-			"column": 17
+			"column": 19
 		},
 		"end": {
 			"line": 3,
-			"column": 39
+			"column": 41
 		}
 	},
 	{
@@ -28,11 +28,11 @@
 		"message": "`ally_missing_attribute` is not a recognised code (did you mean `a11y_missing_attribute`?)",
 		"start": {
 			"line": 8,
-			"column": 17
+			"column": 19
 		},
 		"end": {
 			"line": 8,
-			"column": 39
+			"column": 41
 		}
 	},
 	{
@@ -52,11 +52,11 @@
 		"message": "`a11y-misplaced-scope` is no longer valid — please use `a11y_misplaced_scope` instead",
 		"start": {
 			"line": 13,
-			"column": 17
+			"column": 19
 		},
 		"end": {
 			"line": 13,
-			"column": 37
+			"column": 39
 		}
 	},
 	{