Fix an off-by-one bug in ALEFix

autoload/ale/fix.vim

@@ -31,7 +31,7 @@ function! ale#fix#ApplyQueuedFixes() abort
     let l:start_line = len(l:data.output) + 1
     let l:end_line = len(l:lines)
 
-    if l:end_line > l:start_line
+    if l:end_line >= l:start_line
         let l:save = winsaveview()
         silent execute l:start_line . ',' . l:end_line . 'd'
         call winrestview(l:save)

test/test_ale_fix.vader

@@ -28,6 +28,9 @@ Before:
     return {'command': 'echo x > %t', 'read_temporary_file': 1}
   endfunction
 
+  function RemoveLastLine(buffer, lines) abort
+    return ['a', 'b']
+  endfunction
 After:
   Restore
   unlet! g:ale_run_synchronously
@@ -37,6 +40,7 @@ After:
   delfunction DoNothing
   delfunction CatLine
   delfunction ReplaceWithTempFile
+  delfunction RemoveLastLine
   call ale#fix#registry#ResetToDefaults()
 
 Given testft (A file with three lines):
@@ -137,3 +141,11 @@ Expect(The registry function should be used):
   ^a
   ^b
   ^c
+
+Execute(ALEFix should be able to remove the last line for files):
+  let g:ale_fixers.testft = ['RemoveLastLine']
+  ALEFix
+
+Expect(There should be only two lines):
+  a
+  b