Aug 19 - Update code to catch up with ST

app/utils/decorators.py

@@ -28,6 +28,29 @@ def safe_redirect_url(url: str | None, fallback: str | None = None) -> str:
         return fallback
     return url
 
+def return_url(fallback: str) -> str:
+    """Where to go back to after a list-page action, preserving its filters.
+
+    Reads the `next` value the page carried through the action — POST body
+    first (forms), then query string (links) — and validates it with
+    safe_redirect_url, so a crafted `next` can never redirect off-site.
+
+    The problem this solves: a delete or an edit launched from a filtered list
+    used to redirect to the bare index, throwing away the filters the user had
+    set. Every list-page action now round-trips the list URL instead.
+
+    `next` is deliberately the FULL list URL (page number and all), not a
+    reconstructed set of arguments — that keeps this helper working when a new
+    filter is added to either list page without anyone having to remember to
+    thread it through here.
+    """
+    from flask import request
+    return safe_redirect_url(
+        request.form.get('next') or request.args.get('next'),
+        fallback=fallback,
+    )
+
+
 def admin_required(f):
     @wraps(f)
     def decorated_function(*args, **kwargs):