Reduce useless setTypingState calls on lost focus

TODO.md

@@ -47,7 +47,6 @@
 - Client improvements
   - Filtering rooms: search more than display names?
   - nio.MatrixRoom has `typing_users`, no need to handle it on our own
-  - Don't send setTypingState False when focus lost if nothing in sendbox
   - Initial sync filter and lazy load, see weechat-matrix `_handle_login()`
     - See also `handle_response()`'s `keys_query` request
   - HTTP/2
@@ -64,6 +63,7 @@
   - Keep an accounts order
   - See `Qt.callLater()` potential usages
   - Banner name color instead of bold
+  - Animate RoomEventDelegate DayBreak apparition
 
 - Missing nio support
   - MatrixRoom invited members list

harmonyqml/components/Chat/SendBox.qml

@@ -31,13 +31,23 @@ HRectangle {
             backgroundColor: "transparent"
             area.focus: true
 
+            property bool textChangedSinceLostFocus: false
+
             function setTyping(typing) {
                 Backend.clients.get(chatPage.userId)
                        .setTypingState(chatPage.roomId, typing)
             }
 
-            onTextChanged: setTyping(Boolean(text))
-            area.onEditingFinished: setTyping(false)  // when lost focus
+            onTextChanged: {
+                setTyping(Boolean(text))
+                textChangedSinceLostFocus = true
+            }
+            area.onEditingFinished: {  // when lost focus
+                if (text && textChangedSinceLostFocus) {
+                    setTyping(false)
+                    textChangedSinceLostFocus = false
+                }
+            }
 
             Keys.onReturnPressed: {
                 event.accepted = true