Fix org-caldav: ignore 775 @google.com UIDs + broad error handler

Reverted Fix #1 (@ URL encoding) - caused URL parser issues and was unnecessary.

Fix #2 (updated): 775 events have @google.com UIDs. Emacs URL parser
misinterprets literal @ in path as userinfo separator, connecting to
wrong host -> 5 retries all fail -> crash.

Solution: before-advice on org-caldav-update-events-in-org marks all
@google.com UIDs as 'ignored' before the retrieval loop starts. Org-caldav
natively skips 'ignored' events. Logged to *org-caldav-debug*.

Fix #2 around-advice: catch any remaining errors in update-events-in-org
so sync state is saved even if individual events fail.

Fix #3 (unchanged): set-sequence-number fallback for PUT failures.

config.el

@@ -1775,28 +1775,30 @@ current frame."
   (setq org-caldav-delete-org-entries 'never)
   (setq org-caldav-delete-calendar-entries 'never)
 
-  ;; Fix #1: Baikal stores .ics files with literal @ in filename.
+  ;; Fix #2: Events with @google.com UIDs fail retrieval (Emacs URL parser
-  ;; org-caldav-get-event uses url-hexify-string which encodes @ as %40 → HTTP 404.
+  ;; misinterprets @ in path as userinfo separator, connecting to wrong host).
-  ;; UIDs like ...@google.com are stored on disk as literal @, so we must not encode it.
+  ;; There are 775 such events. Mark them as 'ignored' before update-events-in-org
-  (defadvice org-caldav-get-event (around fix-at-encoding-in-uid
+  ;; processes them. Org-caldav natively skips 'ignored' events.
-                                         (uid &optional with-headers) activate)
+  ;; Also catch any remaining nil-field or retrieval errors to keep sync alive.
-    "Preserve @ in UID path for Baikal CalDAV compatibility."
+  (defadvice org-caldav-update-events-in-org (before ignore-google-uids activate)
-    (cl-letf* ((orig-hexify (symbol-function 'url-hexify-string))
+    "Mark @google.com UIDs as ignored to prevent URL parsing failures."
-               ((symbol-function 'url-hexify-string)
+    (let ((count 0))
-                (lambda (str &optional allowed-chars)
+      (dolist (event org-caldav-event-list)
-                  (replace-regexp-in-string "%40" "@" (funcall orig-hexify str allowed-chars)))))
+        (when (and (stringp (car event))
-      ad-do-it))
+                   (string-match "@google\\.com$" (car event)))
+          (org-caldav-event-set-status event 'ignored)
+          (setq count (1+ count))))
+      (when (> count 0)
+        (message "org-caldav: marked %d @google.com UIDs as ignored" count)
+        (org-caldav-debug-print 1 (format "Ignored %d @google.com UIDs" count)))))
 
-  ;; Fix #2: Some CalDAV events have nil SUMMARY or missing fields, causing
+  (defadvice org-caldav-update-events-in-org (around skip-failed-events activate)
-  ;; Wrong type argument: stringp, nil inside org-caldav-update-events-in-org.
+    "Catch errors during cal->org sync; log and return so sync state is saved."
-  ;; This advice catches the error and logs it so sync continues to save state.
-  (defadvice org-caldav-update-events-in-org (around skip-nil-field-events activate)
-    "Catch nil-field errors from malformed events; log and continue."
     (condition-case err
         ad-do-it
-      (wrong-type-argument
+      (error
-       (message "org-caldav: skipped event with nil field: %S" err)
+       (message "org-caldav: update-events-in-org stopped early: %S" err)
-       (org-caldav-debug-print 1 (format "Skipped nil-field event: %S" err)))))
+       (org-caldav-debug-print 1 (format "update-events-in-org error: %S" err)))))
 
   ;; Fix #3: org-caldav-set-sequence-number calls org-caldav-get-event to read
   ;; the current SEQUENCE from server before pushing updates. If the GET fails