tui: only perform database updates for modified messages

pkg/tui/views/chat/update.go

@@ -29,7 +29,7 @@ func (m *Model) setMessageContents(i int, content string) {
 	if i >= len(m.App.Messages) {
 		panic("i out of range")
 	}
-	m.App.Messages[i].Content = content
+	m.App.SetMessageContents(i, content)
 	m.messageCache[i] = m.renderMessage(i)
 }
 
@@ -91,19 +91,17 @@ func (m *Model) Update(msg tea.Msg) (shared.ViewModel, tea.Cmd) {
 		case input:
 			m.input.SetValue(contents)
 		case selectedMessage:
-			toEdit := m.App.Messages[m.selectedMessage]
-			if toEdit.Content != contents {
-				toEdit.Content = contents
-				m.setMessage(m.selectedMessage, toEdit)
+			if m.App.Messages[m.selectedMessage].Content != contents {
+				m.setMessageContents(m.selectedMessage, contents)
 				m.updateContent()
-				if m.persistence && toEdit.ID > 0 {
+				if m.persistence && m.App.Messages[m.selectedMessage].ID > 0 {
 					// create clone of message with its new contents
-					cmds = append(cmds, m.cloneMessage(toEdit, true))
+					cmds = append(cmds, m.cloneMessage(m.App.Messages[m.selectedMessage], true))
 				}
 			}
 		}
 	case msgConversationMessagesLoaded:
-		m.App.Messages = msg.messages
+		m.App.SetMessages(msg.messages)
 		m.selectedMessage = len(msg.messages) - 1
 		m.rebuildMessageCache()
 		m.updateContent()