[🐴] Fully implement keyboard controller (#4106)

* Revert "[🐴] Ensure keyboard gets dismissed when leaving screen (#4104)"

This reverts commit 3ca671d9aa.

* getting somewhere

* remove some now nuneeded code

* fully implement keyboard controller

* onStartReached check

* fix new messages pill alignment

* scroll to end on press

* simplify pill scroll logic

* update comment

* adjust logic on when to hide the pill

* fix backgrounding jank

* improve look of deleting messages

* add double tap on messages

* better onStartReached logic

* nit

* add hit slop to the gesture

* better gestures for press and hold

* nits

src/screens/Messages/Conversation/index.tsx

@@ -83,6 +83,14 @@ function Inner() {
       !convoState.isFetchingHistory &&
       convoState.items.length === 0)
 
+  // Any time that we re-render the `Initializing` state, we have to reset `hasScrolled` to false. After entering this
+  // state, we know that we're resetting the list of messages and need to re-scroll to the bottom when they get added.
+  React.useEffect(() => {
+    if (convoState.status === ConvoStatus.Initializing) {
+      setHasScrolled(false)
+    }
+  }, [convoState.status])
+
   if (convoState.status === ConvoStatus.Error) {
     return (
       <CenteredView style={a.flex_1} sideBorders>