From a1822a59105d99dfd0198481ed45070173442a6d Mon Sep 17 00:00:00 2001
From: Henry Jameson <me@hjkos.com>
Date: Tue, 11 Aug 2026 13:45:14 +0300
Subject: [PATCH] fix themes v3 not loading

---
 changelog.d/themes3.fix                   | 1 +
 src/api/helpers.js                        | 5 +++--
 src/services/style_setter/style_setter.js | 5 ++++-
 3 files changed, 8 insertions(+), 3 deletions(-)
 create mode 100644 changelog.d/themes3.fix

diff --git a/changelog.d/themes3.fix b/changelog.d/themes3.fix
new file mode 100644
index 000000000..a3192b263
--- /dev/null
+++ b/changelog.d/themes3.fix
@@ -0,0 +1 @@
+Fixed themes 3 not loading in appearance tab
diff --git a/src/api/helpers.js b/src/api/helpers.js
index cb2f2bdd5..b033d80b8 100644
--- a/src/api/helpers.js
+++ b/src/api/helpers.js
@@ -71,6 +71,7 @@ export const promisedRequest = async ({
   url,
   payload,
   formData,
+  forceContentType,
   cache,
   credentials,
   headers = {},
@@ -79,7 +80,7 @@ export const promisedRequest = async ({
     method,
     credentials: 'same-origin',
     headers: {
-      Accept: 'application/json',
+      Accept: forceContentType ?? 'application/json',
       ...headers,
     },
   }
@@ -114,7 +115,7 @@ export const promisedRequest = async ({
     )
     if (contentLength === 0) return null
 
-    switch (contentType) {
+    switch (forceContentType ?? contentType) {
       case 'text/plain':
         return await response.text()
       case 'application/json':
diff --git a/src/services/style_setter/style_setter.js b/src/services/style_setter/style_setter.js
index cb445d2c1..43eaeb3e5 100644
--- a/src/services/style_setter/style_setter.js
+++ b/src/services/style_setter/style_setter.js
@@ -307,7 +307,9 @@ export const applyStyleConfig = (input) => {
   adoptStyleSheets()
 }
 
-export const getResourcesIndex = async (url, parser = (x) => x) => {
+const noop = (x) => x
+
+export const getResourcesIndex = async (url, parser = noop) => {
   const cache = 'no-store'
   const customUrl = url.replace(/\.(\w+)$/, '.custom.$1')
   let builtin
@@ -324,6 +326,7 @@ export const getResourcesIndex = async (url, parser = (x) => x) => {
             promisedRequest({
               url: v,
               cache,
+              forceContentType: parser === noop ? null : 'text/plain',
             })
               .then(({ data: text }) => parser(text))
               .catch((e) => {