Add _has_floating_child

Author: hrsh7th

autoload/vital/__vital__/Async/Promise.vim

@@ -38,6 +38,7 @@ let s:NOOP = funcref('s:noop')
 
 let s:PROMISE = {
     \   '_state': s:PENDING,
+    \   '_has_floating_child': v:false,
     \   '_children': [],
     \   '_fulfillments': [],
     \   '_rejections': [],
@@ -90,7 +91,7 @@ function! s:_publish(promise, ...) abort
   endif
 
   if empty(a:promise._children)
-    if settled == s:REJECTED
+    if settled == s:REJECTED && !a:promise._has_floating_child
       call s:_on_unhandled_rejection(a:promise._result)
     endif
     return
@@ -285,8 +286,10 @@ function! s:_promise_then(...) dict abort
   let l:Res = a:0 > 0 ? a:1 : v:null
   let l:Rej = a:0 > 1 ? a:2 : v:null
   if state == s:FULFILLED
+    let parent._has_floating_child = v:true
     call s:Later.call(funcref('s:_invoke_callback', [state, child, Res, parent._result]))
   elseif state == s:REJECTED
+    let parent._has_floating_child = v:true
     call s:Later.call(funcref('s:_invoke_callback', [state, child, Rej, parent._result]))
   else
     call s:_subscribe(parent, child, Res, Rej)

test/Async/Promise.vimspec

@@ -860,6 +860,15 @@ Describe Async.Promise
       Assert Equals(error, result)
     End
 
+    It should not call when promise catched
+      let l = l:
+      call P.on_unhandled_rejection({ result -> extend(l, { 'result': result }) })
+
+      let p = P.reject({ 'error': 'error' }).catch({ -> {} })
+      call P.wait(Wait(100))
+      Assert KeyNotExists(l, 'result')
+    End
+
     It should not call when promise catched
       let l = l:
       call P.on_unhandled_rejection({ result -> extend(l, { 'result': result }) })