Svelte inspector points to incorrect line number when using `lang="ts"`

[Bladesheng]

Describe the bug
When there is a <script lang="ts"> and I click on a element using the official Svelte inspector, the correct file is opened, but on an incorrect line number.

• When I remove the lang="ts", it works correctly.
• When I use the default preprocessor vitePreprocess from @sveltejs/vite-plugin-svelte, it works correctly as well.
• I started to notice this arround the Svelte 5 release. In Svelte 4, it worked correctly.

The Svelte inspector is reading the file name and line number from element's property __svelte_meta, which is attached during development by Svelte.
When I use svelte-preprocess, the line number is incrorrect.
When I use @sveltejs/vite-plugin-svelte preprocessor, the line number is correct.

To Reproduce

Here is the full reproduction repo https://github.com/Bladesheng/svelte-preprocess-inspector-repro

Or step by step:

• Create new project (SvelteKit minimal, Typescript)

pnpx sv create

• Install svelte-preprocess and Svelte inspector

pnpm i svelte-preprocess @sveltejs/vite-plugin-svelte-inspector

• Use the preprocessor in svelte.config.js instead of the default one

import adapter from '@sveltejs/adapter-auto';
import {sveltePreprocess} from "svelte-preprocess";

const config = {
	preprocess: sveltePreprocess(),
	kit: {adapter: adapter()}
};
export default config;

• Enable Svelte inspector in vite.config.ts

import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vite';
import { svelteInspector } from '@sveltejs/vite-plugin-svelte-inspector';

export default defineConfig({
	plugins: [sveltekit(), svelteInspector({ showToggleButton: 'always' })]
});

• Replace +page.svelte with

<script lang="ts">
    export function func1() {
        console.log(1);

        console.log(2);

        console.log(3);
    }
</script>

<p>paragraph 1</p>

<p>paragraph 2</p>

<p>paragraph 3</p>

• Run the dev server

pnpm dev

• Click on the paragraphs using the svelte inspector icon in top left
• The correct file is opened in editor, but on a wrong line
• It seems that each empty line in the script tag moves the focused line up by one
  • When there are no empty lines in the script tag, the correct line is focused.
  • When there are 2 empty lines in the script tag, the focused line is 2 lines above of where it should be.
• Like I said previously, removing the lang="ts" or using the default preprocessor fixes this

Expected behavior
__svelte_meta should have the correct line number, so Svelte inspector can focus the correct line in your editor.

Information about your project:

• Your browser and the version: chrome 138

• Your operating system: Rocky Linux

• svelte-preprocess version: 6.0.3

• Whether your project uses Webpack or Rollup - Vite with Rollup

[Bladesheng]

I'm guessing this issue could be fixed by this:
#270
#377