state: throttle batched event processing when input is available

before, calling vim.schedule() from inside an event would execute
the scheduled callback immediately after this event without
checking for user input in between. Break event processing
whenever user input or an interrupt is available.

1 files changed, 30 insertions, 8 deletions

diff --git a/test/functional/ui/input_spec.lua b/test/functional/ui/input_spec.lua
index 9313a35708..ea8968a653 100644
--- a/test/functional/ui/input_spec.lua
+++ b/test/functional/ui/input_spec.lua
@@ -1,16 +1,18 @@
 local helpers = require('test.functional.helpers')(after_each)
-local clear, feed_command, nvim = helpers.clear, helpers.feed_command, helpers.nvim
+local clear, feed_command = helpers.clear, helpers.feed_command
 local feed, next_msg, eq = helpers.feed, helpers.next_msg, helpers.eq
 local command = helpers.command
 local expect = helpers.expect
+local meths = helpers.meths
+local exec_lua = helpers.exec_lua
 local write_file = helpers.write_file
 local Screen = require('test.functional.ui.screen')
 
-describe('mappings', function()
-  local cid
+before_each(clear)
 
+describe('mappings', function()
   local add_mapping = function(mapping, send)
-    local cmd = "nnoremap "..mapping.." :call rpcnotify("..cid..", 'mapped', '"
+    local cmd = "nnoremap "..mapping.." :call rpcnotify(1, 'mapped', '"
                 ..send:gsub('<', '<lt>').."')<cr>"
     feed_command(cmd)
   end
@@ -21,8 +23,6 @@ describe('mappings', function()
   end
 
   before_each(function()
-    clear()
-    cid = nvim('get_api_info')[1]
     add_mapping('<C-L>', '<C-L>')
     add_mapping('<C-S-L>', '<C-S-L>')
     add_mapping('<s-up>', '<s-up>')
@@ -115,7 +115,6 @@ describe('mappings', function()
 end)
 
 describe('input utf sequences that contain CSI/K_SPECIAL', function()
-  before_each(clear)
   it('ok', function()
     feed('i…<esc>')
     expect('…')
@@ -129,7 +128,6 @@ describe('input non-printable chars', function()
 
   it("doesn't crash when echoing them back", function()
     write_file("Xtest-overwrite", [[foobar]])
-    clear()
     local screen = Screen.new(60,8)
     screen:set_default_attr_ids({
       [1] = {bold = true, foreground = Screen.colors.Blue1},
@@ -215,3 +213,27 @@ describe('input non-printable chars', function()
     ]])
   end)
 end)
+
+describe("event processing and input", function()
+  it('not blocked by event bursts', function()
+    meths.set_keymap('', '<f2>', "<cmd>lua vim.rpcnotify(1, 'stop') winning = true <cr>", {noremap=true})
+
+    exec_lua [[
+      winning = false
+      burst = vim.schedule_wrap(function(tell)
+        if tell then
+          vim.rpcnotify(1, 'start')
+        end
+        -- Are we winning, son?
+        if not winning then
+          burst(false)
+        end
+      end)
+      burst(true)
+    ]]
+
+    eq({'notification', 'start', {}}, next_msg())
+    feed '<f2>'
+    eq({'notification', 'stop', {}}, next_msg())
+  end)
+end)