Currently when you star a message in chat it appears to the right. However, if the message is more than 150 printable characters the message is truncated at that limit, and has an ellipsis appended to it.
150 chars:
151+ chars:
However, the same truncation is applied to a pinned message. A pinned message is only pinnable by a room owner (or mod?), which typically contains important and helpful information for users.
For example the PHP room:
We have to resort to using abbreviations, and making the decision of omitting items (even if useful), because of the truncation occurring. Can the limit be removed for pinned messages? Right now the chat message is limited to 500 chars (excluding code blocks) and if a message is posted that large and then pinned it should show the entire message.