Fix selection disappearing after delegates unload

Make delegates update their selection when they're loaded again.

TODO.md

@@ -13,6 +13,10 @@
   - When qml syntax highlighting supports ES6 string interpolation, use that
 
 - Fixes
+  - Time on their own lines
+  - When selecting text and scrolling up, selection stops working after a while
+    - Ensure all the text that should be copied is copied
+
   - Missing members pane right padding
   - Pressing backspace in composer sometimes doesn't work
   - Message order isn't preserved when sending a first message in a E2E

src/qml/Base/HSelectableLabel.qml

@@ -18,6 +18,8 @@ TextEdit {
 
     onLinkActivated: Qt.openUrlExternally(link)
 
+    Component.onCompleted: updateSelection()
+
 
     // If index is a whole number, the label will get two \n before itself
     // in container.joinedSelection. If it's a decimal number, if gets one \n.

src/qml/Base/HSelectableLabelContainer.qml

@@ -82,5 +82,6 @@ FocusScope {
         onTapped: clearSelection()
     }
 
+    // This item will trigger the children labels's DropAreas
     Item { id: draggedItem }
 }