Fix #1619 - Rewrite lint on enter events so they behave better

test/test_alejobstarted_autocmd.vader

@@ -1,6 +1,6 @@
-Given testft (An empty file):
-
 Before:
+  Save g:ale_buffer_info
+
   let g:job_started_success = 0
   let g:ale_run_synchronously = 1
 
@@ -10,6 +10,7 @@ Before:
     return []
   endfunction
 
+  call ale#linter#PreventLoading('testft')
   call ale#linter#Define('testft', {
   \ 'name': 'testlinter',
   \ 'callback': 'TestCallback',
@@ -18,8 +19,9 @@ Before:
   \})
 
 After:
+  Restore
+
   let g:ale_run_synchronously = 0
-  let g:ale_buffer_info = {}
 
   try
     augroup! VaderTest
@@ -31,12 +33,13 @@ After:
   delfunction TestCallback
   call ale#linter#Reset()
 
+Given testft (An empty file):
 Execute(Run a lint cycle with an actual job to check for ALEJobStarted):
   augroup VaderTest
     autocmd!
     autocmd User ALEJobStarted let g:job_started_success = 1
   augroup end
 
-  call ale#Lint()
+  ALELint
 
   AssertEqual g:job_started_success, 1