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diff --git a/lib/selectors/chat-selectors.js b/lib/selectors/chat-selectors.js
--- a/lib/selectors/chat-selectors.js
+++ b/lib/selectors/chat-selectors.js
@@ -292,6 +292,7 @@
+threadCreatedFromMessage: ?ThreadInfo,
+reactions: ReactionInfo,
+hasBeenEdited: boolean,
+ +isPinned: boolean,
};
export type ChatMessageItem = { itemType: 'loader' } | ChatMessageInfoItem;
@@ -377,6 +378,24 @@
targetMessageEditMap.set(messageInfo.targetMessageID, messageInfo.text);
}
+ const targetMessagePinStatusMap = new Map<string, boolean>();
+ // Once again, we iterate backwards to put the order of messages in
+ // chronological order (i.e. oldest to newest) to handle pinned messages.
+ // This is important because we want to make sure that the most recent pin
+ // action is the one that is used to determine whether a message
+ // is pinned or not.
+ for (let i = messages.length - 1; i >= 0; i--) {
+ const messageInfo = messages[i];
+ if (messageInfo.type !== messageTypes.TOGGLE_PIN) {
+ continue;
+ }
+
+ targetMessagePinStatusMap.set(
+ messageInfo.targetMessageID,
+ messageInfo.action === 'pin',
+ );
+ }
+
const chatMessageItems = [];
let lastMessageInfo = null;
for (let i = messages.length - 1; i >= 0; i--) {
@@ -438,6 +457,11 @@
? threadInfoFromSourceMessageID[messageInfo.id]
: undefined;
+ const isPinned = !!(
+ originalMessageInfo.id &&
+ targetMessagePinStatusMap.get(originalMessageInfo.id)
+ );
+
const renderedReactions: ReactionInfo = (() => {
const result = {};
@@ -496,6 +520,7 @@
threadCreatedFromMessage,
reactions: renderedReactions,
hasBeenEdited,
+ isPinned,
});
} else {
invariant(

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