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[stable35] fix(attachments): normalize attachment names to Unicode NFC - #9396
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Files uploaded from macOS in Chrome or Firefox have NFD names, while the filecache, and therefore the attachment list, stores names in NFC. The upload response returned the raw NFD name, so the editor inserted an NFD `src`. AttachmentResolver compared names exactly, found no matching attachment and fell back to loading the file as an image, which failed. Normalize uploaded names to NFC before saving them, and compare names in NFC in AttachmentResolver so that documents that already contain NFD srcs resolve as well. Fixes: #7873 Refs: nextcloud/server#65514 Refs: nextcloud/collectives#2327 Signed-off-by: Jonas <jonas@freesources.org> Assisted-by: ClaudeCode:claude-opus-5-5
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Backport of PR #9388