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Title: Synchronet webv4 fix forum navigation stall (issue #1129)

Date: Wed, 01 Jul 2026 09:55:34 GMT
Link: https://gitlab.synchro.net/main/sbbs/-/merge_...

TLDR: Sync's webv4 is now very fast and does not stall. Detail: Two changes
to address long pauses when navigating the webv4 forum: 1) webv4/lib/forum.js
Remove unnecessary MsgBase open/close from listSubs. The two fields requiring
an open MsgBase (unread, newest) are both commented out, making the
open/close pure overhead. This caused multi second page render stalls on
every click. 2) webv4/root/js/common.js - Add AbortController to v4_fetch()
so in-flight AJAX requests are cancelled when a new request is made,
preventing orphaned server-side threads from accumulating during rapid
navigation. Also adds beforeunload handler to close the EventSource
connection cleanly on navigation. Download Sync nightly build to update:
[https://wiki.synchro.net/install:dev] [https://gitlab.synchro.net/main/sbbs/-
/merge_requests/703]

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