Merge pull request #13205 from romgrk/add-bufmodified-autocmd

Implement BufModifiedSet autocmd

test/functional/autocmd/bufmodifiedset_spec.lua

@@ -0,0 +1,22 @@
+local helpers = require('test.functional.helpers')(after_each)
+
+local clear = helpers.clear
+local eq = helpers.eq
+local eval = helpers.eval
+local source = helpers.source
+local request = helpers.request
+
+describe('BufModified', function()
+  before_each(clear)
+
+  it('is triggered when modified and un-modified', function()
+    source([[
+    let g:modified = 0
+    autocmd BufModifiedSet * let g:modified += 1
+    ]])
+    request("nvim_command", [[normal! aa\<Esc>]])
+    eq(1, eval('g:modified'))
+    request("nvim_command", [[normal! u]])
+    eq(2, eval('g:modified'))
+  end)
+end)