fix: expiration update to off expire with previous expiration settings

ts/components/conversation/ExpireTimer.tsx

@@ -8,7 +8,6 @@ import { SessionIcon } from '../icon/SessionIcon';
 
 const ExpireTimerBucket = styled.div`
   font-size: var(--font-size-xs);
-  line-height: 16px;
   letter-spacing: 0.3px;
   text-transform: uppercase;
   user-select: none;

ts/components/conversation/message/message-content/MessageStatus.tsx

@@ -72,7 +72,7 @@ const MessageStatusContainer = styled.div<{ isIncoming: boolean }>`
   margin-inline-start: 5px;
   cursor: pointer;
   display: flex;
-  align-items: baseline;
+  align-items: center;
 `;
 
 const StyledStatusText = styled.div`

ts/models/conversation.ts

@@ -856,9 +856,12 @@ export class ConversationModel extends Backbone.Model<ConversationAttributes> {
       return false;
     }
 
+    const previousExpirationMode = this.getExpirationMode();
+    const previousExpirationTimer = this.getExpireTimer();
+
     if (
-      isEqual(expirationMode, this.getExpirationMode()) &&
+      isEqual(expirationMode, previousExpirationMode) &&
-      isEqual(expireTimer, this.getExpireTimer())
+      isEqual(expireTimer, previousExpirationTimer)
     ) {
       window.log.debug(
         `[updateExpireTimer]  Ignoring ExpireTimerUpdate ${
@@ -898,6 +901,11 @@ export class ConversationModel extends Backbone.Model<ConversationAttributes> {
       expirationMode
     );
 
+    // For some reasons, we want a timer update to "off" to disappear with the previous setting on that conversation...
+    const shouldUsePreviousExpiration =
+      expirationType === 'unknown' &&
+      previousExpirationMode !== 'off' &&
+      previousExpirationMode !== 'legacy';
     const commonAttributes = {
       flags: SignalService.DataMessage.Flags.EXPIRATION_TIMER_UPDATE,
       expirationTimerUpdate: {
@@ -927,6 +935,11 @@ export class ConversationModel extends Backbone.Model<ConversationAttributes> {
           received_at: timestamp,
         });
       }
+    } else {
+      message.set({
+        expirationType: shouldUsePreviousExpiration ? previousExpirationMode : expirationType,
+        expireTimer: shouldUsePreviousExpiration ? previousExpirationTimer : expireTimer,
+      });
     }
 
     if (this.isActive()) {

ts/session/disappearing_messages/index.ts

@@ -459,9 +459,7 @@ function getMessageReadyToDisappear(
 
   if (conversationModel.isPublic()) {
     throw Error(
-      `getMessageReadyToDisappear() Disappearing messages aren't supported in communities. Message id: ${messageModel.get(
+      `getMessageReadyToDisappear() Disappearing messages aren't supported in communities`
-        'id'
-      )}`
     );
   }
 
@@ -480,6 +478,20 @@ function getMessageReadyToDisappear(
 
   // This message is an ExpirationTimerUpdate
   if (lastDisappearingMessageChangeTimestamp || isLegacyConversationSettingMessage) {
+    const previousExpirationMode = conversationModel.getExpirationMode();
+    const previousExpirationTimer = conversationModel.getExpireTimer();
+    const shouldUsePreviousExpiration =
+      expirationType === 'unknown' &&
+      previousExpirationMode !== 'off' &&
+      previousExpirationMode !== 'legacy';
+
+    if (shouldUsePreviousExpiration) {
+      messageModel.set({
+        expirationType: previousExpirationMode,
+        expireTimer: previousExpirationTimer,
+      });
+    }
+
     const expirationTimerUpdate = {
       expirationType,
       expireTimer,