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Two problems with `C-; S !'. First, emacs-slack's `slack-reaction-echo-description' runs in a buffer-local `post-command-hook' and can error on every keystroke when a reaction widget's text properties are malformed, which makes it hard to leave the Slack buffer or recover with C-g. It's now wrapped in `condition-case' that, on error, removes the hook from that buffer's local `post-command-hook' and messages once. Second, without emojify the upstream reaction picker is a flat completing-read over 1600+ names. `cj/slack-message-add-reaction' now offers a curated common list (`thumbsup', `pray', `eyes', `white_check_mark', `heart', `joy', `thinking_face', `rocket', `tada') with "Other..." delegating back to `slack-message-reaction-input' for the full set. Tests cover the hook hardening, the curated picker, and the `C-; S !' rebinding.
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