Fix local draft attachments erased when draft updated event is triggered

[nuno-vieira]

🔗 Issue Links

Resolves IOS-757

🎯 Goal

Fix local draft attachments being deleted when navigating back to the channel list.

🛠 Implementation

The issue was that when navigating to the Channel List, it would save the draft message, but the draft.update event would be triggered as well, and we were wrongly deleting the existing local draft, which would erase the local attachments.

🧪 Manual Testing Notes

1- Open a channel
2- Save a draft with attachment
3- Go to the channel list
4- The attachemnt should appear and not disappear from the draft preview

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• This change should be manually QAed
• Changelog is updated with client-facing changes
• Changelog is updated with new localization keys
• New code is covered by unit tests
• Documentation has been updated in the docs-content repo

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
StreamChat	7.41 MB	7.41 MB	0 KB	🟢
StreamChatUI	4.78 MB	4.78 MB	0 KB	🟢

[Stream-SDK-Bot]

SDK Performance

target	metric	benchmark	branch	performance	status
MessageList	Hitches total duration	10 ms	11.68 ms	-16.8% 🔽	🔴
	Duration	2.6 s	2.55 s	1.92% 🔼	🟢
	Hitch time ratio	4 ms per s	4.57 ms per s	-14.25% 🔽	🔴
	Frame rate	75 fps	77.89 fps	3.85% 🔼	🟢
	Number of hitches	1	1.0	0.0% 🟰	🟢

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
StreamChat	7.41 MB	7.41 MB	0 KB	🟢
StreamChatUI	4.78 MB	4.78 MB	0 KB	🟢

[laevandus]

✅ Looks great. Verified it manually and the draft message with attachments did not get removed. Also tried quitting the app and relaunching it - all good.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud