Lowers log level to debug (#806)

* Lowers log level to debug

This message isn't immediately actionable for developers and can reasonably be considered debugging output. Therefore, the log level has been updated to reflect this.

* Adds a debug section

This commit adds a debug section for "hmr" to the line, as suggested by @dominikg.

Co-authored-by: Dominik G. <dominik.goepel@gmx.de>

* Adds changeset

---------

Co-authored-by: Dominik G. <dominik.goepel@gmx.de>

Author: Radiergummi

.changeset/wet-drinks-call.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/vite-plugin-svelte': patch
+---
+
+Update log level for HMR updates where the output is functionally equivalent to the previous version to "debug"

packages/vite-plugin-svelte/src/handle-hot-update.js

@@ -104,8 +104,10 @@ function jsChanged(prev, next, filename) {
 	}
 	const isLooseEqual = isCodeEqual(normalizeJsCode(prevJs), normalizeJsCode(nextJs));
 	if (!isStrictEqual && isLooseEqual) {
-		log.warn(
-			`ignoring compiler output js change for ${filename} as it is equal to previous output after normalization`
+		log.debug(
+			`ignoring compiler output js change for ${filename} as it is equal to previous output after normalization`,
+			undefined,
+			'hmr'
 		);
 	}
 	return !isLooseEqual;