Fix diff coloring for added and removed text in field diffs

- Update default `text_diff_added` value: red -> green
- Use `text_diff_removed` and `text_diff_added` instead of `text_error`
  in UI

beets/config_default.yaml

@@ -131,7 +131,7 @@ ui:
         import_path: ['bold', 'blue']
         import_path_items: ['bold', 'blue']
         changed: ['yellow']
-        text_diff_added:   ['bold', 'red']
+        text_diff_added: ['bold', 'green']
         text_diff_removed: ['bold', 'red']
         action_description: ['white']
     import:

beets/ui/__init__.py

@@ -1103,8 +1103,8 @@ def _field_diff(field, old, old_fmt, new, new_fmt):
     if isinstance(oldval, str):
         oldstr, newstr = colordiff(oldval, newstr)
     else:
-        oldstr = colorize("text_error", oldstr)
+        oldstr = colorize("text_diff_removed", oldstr)
-        newstr = colorize("text_error", newstr)
+        newstr = colorize("text_diff_added", newstr)
 
     return f"{oldstr} -> {newstr}"
 

docs/changelog.rst

@@ -135,6 +135,10 @@ Other changes:
   file. :bug:`5979`
 - :doc:`plugins/lastgenre`: Updated and streamlined the genre whitelist and
   canonicalization tree :bug:`5977`
+- UI: Update default ``text_diff_added`` color from **bold red** to **bold
+  green.**
+- UI: Use ``text_diff_added`` and ``text_diff_removed`` colors in **all** diff
+  comparisons.
 
 2.3.1 (May 14, 2025)
 --------------------

docs/reference/config.rst

@@ -469,7 +469,7 @@ your configuration file that looks like this:
             import_path: ['bold', 'blue']
             import_path_items: ['bold', 'blue']
             changed: ['yellow']
-            text_diff_added:   ['bold', 'red']
+            text_diff_added: ['bold', 'green']
             text_diff_removed: ['bold', 'red']
             action_description: ['white']