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Every department of an operator bot gets a Topic icon select in Edit bot departments: one of Telegram's free topic icons (getForumTopicIconStickers, no Premium needed) or the default icon in one of the six colours. Stored in lhc_telegram_bot_dep.topic_icon and passed to the three createForumTopic calls as icon_custom_emoji_id / icon_color. Mobile clients otherwise draw the first letter of the topic name, which is "[" for every chat topic.
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lhc_telegram_bot_dep.topic_label: when set, topic names start with "<label> ·" instead of "[Department]" (also on page change), so a coloured default icon shows a meaningful letter instead of "[". Edit bot departments shows a preview of the icon and the topic name for every department.
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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What
Next to every department in
Telegram bots > Edit bot departments(operator bots):getForumTopicIconStickers— bots may use only these, no Telegram Premium needed) →icon_custom_emoji_id; or the default icon in one of the six allowed colours →icon_color; nothing → the default icon, as now.Department ·instead of[Department], e.g.Sales · Nick #12 | …, so the first letter is the department's, not[.<label> ·instead, e.g.TG · Nick #12 | …. A coloured default icon shows the first letter of the topic name, so it becomes a blueT.Why: mobile clients draw the first letter of the topic name as its icon, and for chat topics that is always
[([Department] Nick #id …), so every topic looks the same in the topic list.How
lhc_telegram_bot_dep.topic_iconandtopic_label(varchar(50),doc/structure.json/doc/install.sql). The icon value is checked against the icon set and the colour list before saving.providers/TelegramTopicIcons.php:addIcon()wraps the data of the threecreateForumTopiccalls,topicPrefix()builds the start of the topic name in the four places it is built (includingeditForumTopicon page change). The icon set is cached for a day incache/telegram_topic_icons_<bot id>.json; on an API error topics are created without an icon.Without any setting topics get the default icon as now; only the brackets around the department name are gone. #102 (mail topics) uses the same helper when it is present.
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