Close #3333 - Add an ALECompletePost event

Add an `ALECompletePost` event along with everything needed to make it
useful for its primary purpose: fixing code after inserting completions.

* `ALEFix` can now be called with a bang (`!`) to suppress errors.
* A new `ALELintStop` command lets you stop linting, and start it later.

12 files changed, 271 insertions, 90 deletions

diff --git a/autoload/ale/completion.vim b/autoload/ale/completion.vim
index bdade95c..ecd93600 100644
--- a/autoload/ale/completion.vim
+++ b/autoload/ale/completion.vim
@@ -503,17 +503,19 @@ function! ale#completion#ParseTSServerCompletionEntryDetails(response) abort
         \       ||  g:ale_completion_autoimport,
         \   'info': join(l:documentationParts, ''),
         \}
+        " This flag is used to tell if this completion came from ALE or not.
+        let l:user_data = {'_ale_completion_item': 1}
 
         if has_key(l:suggestion, 'codeActions')
-            let l:result.user_data = json_encode({
-            \   'codeActions': l:suggestion.codeActions,
-            \ })
+            let l:user_data.code_actions = l:suggestion.codeActions
         endif
 
+        let l:result.user_data = json_encode(l:user_data)
+
         " Include this item if we'll accept any items,
         " or if we only want items with additional edits, and this has them.
         if !get(l:info, 'additional_edits_only', 0)
-        \|| has_key(l:result, 'user_data')
+        \|| has_key(l:user_data, 'code_actions')
             call add(l:results, l:result)
         endif
     endfor
@@ -534,6 +536,7 @@ function! ale#completion#ParseTSServerCompletionEntryDetails(response) abort
             \   'icase': 1,
             \   'menu': '',
             \   'info': '',
+            \   'user_data': json_encode({'_ale_completion_item': 1}),
             \})
         endfor
     endif
@@ -610,6 +613,8 @@ function! ale#completion#ParseLSPCompletions(response) abort
         \   'menu': get(l:item, 'detail', ''),
         \   'info': (type(l:doc) is v:t_string ? l:doc : ''),
         \}
+        " This flag is used to tell if this completion came from ALE or not.
+        let l:user_data = {'_ale_completion_item': 1}
 
         if has_key(l:item, 'additionalTextEdits')
             let l:text_changes = []
@@ -629,24 +634,24 @@ function! ale#completion#ParseLSPCompletions(response) abort
             endfor
 
             if !empty(l:text_changes)
-                let l:result.user_data = json_encode({
-                \   'codeActions': [{
-                \       'description': 'completion',
-                \       'changes': [
-                \           {
-                \               'fileName': expand('#' . l:buffer . ':p'),
-                \               'textChanges': l:text_changes,
-                \           }
-                \       ],
-                \   }],
-                \})
+                let l:user_data.code_actions = [{
+                \   'description': 'completion',
+                \   'changes': [
+                \       {
+                \           'fileName': expand('#' . l:buffer . ':p'),
+                \           'textChanges': l:text_changes,
+                \       },
+                \   ],
+                \}]
             endif
         endif
 
+        let l:result.user_data = json_encode(l:user_data)
+
         " Include this item if we'll accept any items,
         " or if we only want items with additional edits, and this has them.
         if !get(l:info, 'additional_edits_only', 0)
-        \|| has_key(l:result, 'user_data')
+        \|| has_key(l:user_data, 'code_actions')
             call add(l:results, l:result)
         endif
     endfor
@@ -983,30 +988,29 @@ function! ale#completion#Queue() abort
 endfunction
 
 function! ale#completion#HandleUserData(completed_item) abort
-    let l:source = get(get(b:, 'ale_completion_info', {}), 'source', '')
-
-    if l:source isnot# 'ale-automatic'
-    \&& l:source isnot# 'ale-manual'
-    \&& l:source isnot# 'ale-callback'
-    \&& l:source isnot# 'ale-import'
-        return
-    endif
-
     let l:user_data_json = get(a:completed_item, 'user_data', '')
+    let l:user_data = !empty(l:user_data_json)
+    \   ? json_decode(l:user_data_json)
+    \   : v:null
 
-    if empty(l:user_data_json)
+    if type(l:user_data) isnot v:t_dict
+    \|| get(l:user_data, '_ale_completion_item', 0) isnot 1
         return
     endif
 
-    let l:user_data = json_decode(l:user_data_json)
+    let l:source = get(get(b:, 'ale_completion_info', {}), 'source', '')
 
-    if type(l:user_data) isnot v:t_dict
-        return
+    if l:source is# 'ale-automatic'
+    \|| l:source is# 'ale-manual'
+    \|| l:source is# 'ale-callback'
+    \|| l:source is# 'ale-import'
+    \|| l:source is# 'ale-omnifunc'
+        for l:code_action in get(l:user_data, 'code_actions', [])
+            call ale#code_action#HandleCodeAction(l:code_action, v:false)
+        endfor
     endif
 
-    for l:code_action in get(l:user_data, 'codeActions', [])
-        call ale#code_action#HandleCodeAction(l:code_action, v:false)
-    endfor
+    silent doautocmd <nomodeline> User ALECompletePost
 endfunction
 
 function! ale#completion#Done() abort
diff --git a/autoload/ale/engine.vim b/autoload/ale/engine.vim
index ae0354b8..63195d0f 100644
--- a/autoload/ale/engine.vim
+++ b/autoload/ale/engine.vim
@@ -458,6 +458,10 @@ function! s:StopCurrentJobs(buffer, clear_lint_file_jobs) abort
     endif
 endfunction
 
+function! ale#engine#Stop(buffer) abort
+    call s:StopCurrentJobs(a:buffer, 1)
+endfunction
+
 function! s:RemoveProblemsForDisabledLinters(buffer, linters) abort
     " Figure out which linters are still enabled, and remove
     " problems for linters which are no longer enabled.
diff --git a/autoload/ale/fix.vim b/autoload/ale/fix.vim
index 8b841b13..c3338fc5 100644
--- a/autoload/ale/fix.vim
+++ b/autoload/ale/fix.vim
@@ -75,7 +75,10 @@ function! ale#fix#ApplyFixes(buffer, output) abort
 
         if l:data.lines_before != l:lines
             call remove(g:ale_fix_buffer_data, a:buffer)
-            execute 'echoerr ''The file was changed before fixing finished'''
+
+            if !l:data.ignore_file_changed_errors
+                execute 'echoerr ''The file was changed before fixing finished'''
+            endif
 
             return
         endif
@@ -329,6 +332,7 @@ function! ale#fix#InitBufferData(buffer, fixing_flag) abort
     \   'lines_before': getbufline(a:buffer, 1, '$'),
     \   'done': 0,
     \   'should_save': a:fixing_flag is# 'save_file',
+    \   'ignore_file_changed_errors': a:fixing_flag is# '!',
     \   'temporary_directory_list': [],
     \}
 endfunction
@@ -337,19 +341,23 @@ endfunction
 "
 " Returns 0 if no fixes can be applied, and 1 if fixing can be done.
 function! ale#fix#Fix(buffer, fixing_flag, ...) abort
-    if a:fixing_flag isnot# '' && a:fixing_flag isnot# 'save_file'
-        throw "fixing_flag must be either '' or 'save_file'"
+    if a:fixing_flag isnot# ''
+    \&& a:fixing_flag isnot# '!'
+    \&& a:fixing_flag isnot# 'save_file'
+        throw "fixing_flag must be '', '!', or 'save_file'"
     endif
 
     try
         let l:callback_list = s:GetCallbacks(a:buffer, a:fixing_flag, a:000)
     catch /E700\|BADNAME/
-        let l:function_name = join(split(split(v:exception, ':')[3]))
-        let l:echo_message = printf(
-        \   'There is no fixer named `%s`. Check :ALEFixSuggest',
-        \   l:function_name,
-        \)
-        execute 'echom l:echo_message'
+        if a:fixing_flag isnot# '!'
+            let l:function_name = join(split(split(v:exception, ':')[3]))
+            let l:echo_message = printf(
+            \   'There is no fixer named `%s`. Check :ALEFixSuggest',
+            \   l:function_name,
+            \)
+            execute 'echom l:echo_message'
+        endif
 
         return 0
     endtry
diff --git a/doc/ale.txt b/doc/ale.txt
index 7549dc01..e6b91be8 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -147,6 +147,8 @@ ALE offers several options for controlling which linters are run.
 * Disabling only a subset of linters.  - |g:ale_linters_ignore|
 * Disabling LSP linters and `tsserver`.  - |g:ale_disable_lsp|
 
+You can stop ALE any currently running linters with the |ALELintStop| command.
+Any existing problems will be kept.
 
 -------------------------------------------------------------------------------
 3.1 Linting On Other Machines                         *ale-lint-other-machines*
@@ -532,6 +534,9 @@ potential completion result which includes additional text to insert into the
 current buffer, which ALE will assume is code for an import line. This command
 can be useful when your code already contains something you need to import.
 
+You can execute other commands whenever ALE inserts some completion text with
+the |ALECompletePost| event.
+
 When working with TypeScript files, ALE can remove warnings from your
 completions by setting the |g:ale_completion_tsserver_remove_warnings|
 variable to 1.
@@ -2976,6 +2981,10 @@ ALEFix                                                                 *ALEFix*
 
   Fix problems with the current buffer. See |ale-fix| for more information.
 
+  If the command is run with a bang (`:ALEFix!`), all warnings will be
+  suppressed, including warnings about no fixers being defined, and warnings
+  about not being able to apply fixes to a file because it has been changed.
+
   A plug mapping `<Plug>(ale_fix)` is defined for this command.
 
 
@@ -3115,6 +3124,13 @@ ALELint                                                               *ALELint*
   A plug mapping `<Plug>(ale_lint)` is defined for this command.
 
 
+ALELintStop                                                       *ALELintStop*
+
+  Stop any currently running jobs for checking the current buffer.
+
+  Any problems from previous linter results will continue to be shown.
+
+
 ALEPrevious                                                       *ALEPrevious*
 ALEPreviousWrap                                               *ALEPreviousWrap*
 ALENext                                                               *ALENext*
@@ -3980,6 +3996,23 @@ g:ale_want_results_buffer                           *g:ale_want_results_buffer*
   figure out which buffer other sources should lint.
 
 
+ALECompletePost                                       *ALECompletePost-autocmd*
+                                                              *ALECompletePost*
+
+  This |User| autocmd is triggered after ALE inserts an item on
+  |CompleteDone|. This event can be used to run commands after a buffer
+  is changed by ALE as the result of completion. For example, |ALEFix| can
+  be configured to run automatically when completion is done: >
+
+  augroup FixAfterComplete
+      autocmd!
+      " Run ALEFix when completion items are added.
+      autocmd User ALECompletePost ALEFix!
+      " If ALE starts fixing a file, stop linters running for now.
+      autocmd User ALEFixPre ALELintStop
+  augroup END
+<
+
 ALELintPre                                                 *ALELintPre-autocmd*
                                                                    *ALELintPre*
 ALELintPost                                               *ALELintPost-autocmd*
diff --git a/plugin/ale.vim b/plugin/ale.vim
index 9cebb71f..18d867ee 100644
--- a/plugin/ale.vim
+++ b/plugin/ale.vim
@@ -195,6 +195,8 @@ command! -bar ALEStopAllLSPs :call ale#lsp#reset#StopAllLSPs()
 
 " A command for linting manually.
 command! -bar ALELint :call ale#Queue(0, 'lint_file')
+" Stop current jobs when linting.
+command! -bar ALELintStop :call ale#engine#Stop(bufnr(''))
 
 " Define a command to get information about current filetype.
 command! -bar ALEInfo :call ale#debugging#Info()
@@ -204,7 +206,7 @@ command! -bar ALEInfoToClipboard :call ale#debugging#InfoToClipboard()
 command! -bar -nargs=1 ALEInfoToFile :call ale#debugging#InfoToFile(<f-args>)
 
 " Fix problems in files.
-command! -bar -nargs=* -complete=customlist,ale#fix#registry#CompleteFixers ALEFix :call ale#fix#Fix(bufnr(''), '', <f-args>)
+command! -bar -bang -nargs=* -complete=customlist,ale#fix#registry#CompleteFixers ALEFix :call ale#fix#Fix(bufnr(''), '<bang>', <f-args>)
 " Suggest registered functions to use for fixing problems.
 command! -bar ALEFixSuggest :call ale#fix#registry#Suggest(&filetype)
 
diff --git a/rplugin/python3/deoplete/sources/ale.py b/rplugin/python3/deoplete/sources/ale.py
index ae1f4039..82d9bbf2 100644
--- a/rplugin/python3/deoplete/sources/ale.py
+++ b/rplugin/python3/deoplete/sources/ale.py
@@ -49,12 +49,13 @@ class Source(Base):
 
         if event == 'Async':
             result = self.vim.call('ale#completion#GetCompletionResult')
+
             return result or []
 
         if context.get('is_refresh'):
             self.vim.command(
-                "call ale#completion#GetCompletions('ale-callback', " + \
-                "{'callback': {completions -> deoplete#auto_complete() }})"
+                "call ale#completion#GetCompletions('ale-callback', "
+                + "{'callback': {completions -> deoplete#auto_complete() }})"
             )
 
         return []
diff --git a/test/completion/test_complete_events.vader b/test/completion/test_complete_events.vader
new file mode 100644
index 00000000..cee15985
--- /dev/null
+++ b/test/completion/test_complete_events.vader
@@ -0,0 +1,35 @@
+Before:
+  let g:complete_post_triggered = 0
+
+  augroup VaderTest
+    autocmd!
+    autocmd User ALECompletePost let g:complete_post_triggered = 1
+  augroup END
+
+After:
+  unlet! b:ale_completion_info
+  unlet! g:complete_post_triggered
+
+  augroup VaderTest
+    autocmd!
+  augroup END
+
+  augroup! VaderTest
+
+Execute(ALECompletePost should not be triggered when completion is cancelled):
+  call ale#completion#HandleUserData({})
+
+  Assert !g:complete_post_triggered
+
+Execute(ALECompletePost should not be triggered when tools other than ALE insert completions):
+  call ale#completion#HandleUserData({'user_data': ''})
+  call ale#completion#HandleUserData({'user_data': '{}'})
+
+  Assert !g:complete_post_triggered
+
+Execute(ALECompletePost should be triggered when ALE inserts completions):
+  call ale#completion#HandleUserData({
+  \ 'user_data': json_encode({'_ale_completion_item': 1}),
+  \})
+
+  Assert g:complete_post_triggered
diff --git a/test/completion/test_completion_events.vader b/test/completion/test_completion_events.vader
index 87bd10ad..f678e773 100644
--- a/test/completion/test_completion_events.vader
+++ b/test/completion/test_completion_events.vader
@@ -407,41 +407,75 @@ Execute(HandleUserData should call ale#code_action#HandleCodeAction):
   AssertEqual g:handle_code_action_called, 0
 
   call ale#completion#HandleUserData({
-  \  'user_data': ''
+  \ 'user_data': ''
   \})
   AssertEqual g:handle_code_action_called, 0
 
   call ale#completion#HandleUserData({
-  \  'user_data': '{}'
+  \ 'user_data': json_encode({}),
   \})
   AssertEqual g:handle_code_action_called, 0
 
   call ale#completion#HandleUserData({
-  \  'user_data': '{"codeActions": []}'
+  \ 'user_data': json_encode({
+  \   '_ale_completion_item': 1,
+  \   'code_actions': [],
+  \ }),
   \})
   AssertEqual g:handle_code_action_called, 0
 
   call ale#completion#HandleUserData({
-  \  'user_data': '{"codeActions": [{"description":"", "changes": []}]}'
+  \ 'user_data': json_encode({
+  \   '_ale_completion_item': 1,
+  \   'code_actions': [
+  \     {'description': '', 'changes': []},
+  \   ],
+  \ }),
   \})
   AssertEqual g:handle_code_action_called, 1
 
   let b:ale_completion_info = {'source': 'ale-automatic'}
   call ale#completion#HandleUserData({
-  \  'user_data': '{"codeActions": [{"description":"", "changes": []}]}'
+  \ 'user_data': json_encode({
+  \   '_ale_completion_item': 1,
+  \   'code_actions': [
+  \     {'description': '', 'changes': []},
+  \   ],
+  \ }),
   \})
   AssertEqual g:handle_code_action_called, 2
 
   let b:ale_completion_info = {'source': 'ale-callback'}
   call ale#completion#HandleUserData({
-  \  'user_data': '{"codeActions": [{"description":"", "changes": []}]}'
+  \ 'user_data': json_encode({
+  \   '_ale_completion_item': 1,
+  \   'code_actions': [
+  \     {'description': '', 'changes': []},
+  \   ],
+  \ }),
   \})
   AssertEqual g:handle_code_action_called, 3
 
+  let b:ale_completion_info = {'source': 'ale-omnifunc'}
+  call ale#completion#HandleUserData({
+  \ 'user_data': json_encode({
+  \   '_ale_completion_item': 1,
+  \   'code_actions': [
+  \     {'description': '', 'changes': []},
+  \   ],
+  \ }),
+  \})
+  AssertEqual g:handle_code_action_called, 4
+
 Execute(ale#code_action#HandleCodeAction should not be called when when source is not ALE):
   call MockHandleCodeAction()
   let b:ale_completion_info = {'source': 'syntastic'}
   call ale#completion#HandleUserData({
-  \  'user_data': '{"codeActions": [{"description":"", "changes": []}]}'
+  \ 'user_data': json_encode({
+  \   '_ale_completion_item': 1,
+  \   'code_actions': [
+  \     {'description': '', 'changes': []},
+  \   ],
+  \ }),
   \})
   AssertEqual g:handle_code_action_called, 0
diff --git a/test/completion/test_lsp_completion_parsing.vader b/test/completion/test_lsp_completion_parsing.vader
index b8e71320..d989aefe 100644
--- a/test/completion/test_lsp_completion_parsing.vader
+++ b/test/completion/test_lsp_completion_parsing.vader
@@ -12,34 +12,34 @@ After:
 Execute(Should handle Rust completion results correctly):
   AssertEqual
   \ [
-  \   {'word': 'new', 'menu': 'pub fn new() -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'with_capacity', 'menu': 'pub fn with_capacity(capacity: usize) -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from_utf8', 'menu': 'pub fn from_utf8(vec: Vec<u8>) -> Result<String, FromUtf8Error>', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from_utf8_lossy', 'menu': 'pub fn from_utf8_lossy<''a>(v: &''a [u8]) -> Cow<''a, str>', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from_utf16', 'menu': 'pub fn from_utf16(v: &[u16]) -> Result<String, FromUtf16Error>', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from_utf16_lossy', 'menu': 'pub fn from_utf16_lossy(v: &[u16]) -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from_raw_parts', 'menu': 'pub unsafe fn from_raw_parts(buf: *mut u8, length: usize, capacity: usize) -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from_utf8_unchecked', 'menu': 'pub unsafe fn from_utf8_unchecked(bytes: Vec<u8>) -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from_iter', 'menu': 'fn from_iter<I: IntoIterator<Item = char>>(iter: I) -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from_iter', 'menu': 'fn from_iter<I: IntoIterator<Item = &''a char>>(iter: I) -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from_iter', 'menu': 'fn from_iter<I: IntoIterator<Item = &''a str>>(iter: I) -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from_iter', 'menu': 'fn from_iter<I: IntoIterator<Item = String>>(iter: I) -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from_iter', 'menu': 'fn from_iter<I: IntoIterator<Item = Cow<''a, str>>>(iter: I) -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'Searcher', 'menu': 'type Searcher = <&''b str as Pattern<''a>>::Searcher;', 'info': '', 'kind': 't', 'icase': 1},
-  \   {'word': 'default', 'menu': 'fn default() -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'Output', 'menu': 'type Output = String;', 'info': '', 'kind': 't', 'icase': 1},
-  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1},
-  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1},
-  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1},
-  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1},
-  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1},
-  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1},
-  \   {'word': 'Target', 'menu': 'type Target = str;', 'info': '', 'kind': 't', 'icase': 1},
-  \   {'word': 'Err', 'menu': 'type Err = ParseError;', 'info': '', 'kind': 't', 'icase': 1},
-  \   {'word': 'from_str', 'menu': 'fn from_str(s: &str) -> Result<String, ParseError>', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from', 'menu': 'fn from(s: &''a str) -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from', 'menu': 'fn from(s: Box<str>) -> String', 'info': '', 'kind': 'f', 'icase': 1},
-  \   {'word': 'from', 'menu': 'fn from(s: Cow<''a, str>) -> String', 'info': '', 'kind': 'f', 'icase': 1},
+  \   {'word': 'new', 'menu': 'pub fn new() -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'with_capacity', 'menu': 'pub fn with_capacity(capacity: usize) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_utf8', 'menu': 'pub fn from_utf8(vec: Vec<u8>) -> Result<String, FromUtf8Error>', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_utf8_lossy', 'menu': 'pub fn from_utf8_lossy<''a>(v: &''a [u8]) -> Cow<''a, str>', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_utf16', 'menu': 'pub fn from_utf16(v: &[u16]) -> Result<String, FromUtf16Error>', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_utf16_lossy', 'menu': 'pub fn from_utf16_lossy(v: &[u16]) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_raw_parts', 'menu': 'pub unsafe fn from_raw_parts(buf: *mut u8, length: usize, capacity: usize) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_utf8_unchecked', 'menu': 'pub unsafe fn from_utf8_unchecked(bytes: Vec<u8>) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_iter', 'menu': 'fn from_iter<I: IntoIterator<Item = char>>(iter: I) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_iter', 'menu': 'fn from_iter<I: IntoIterator<Item = &''a char>>(iter: I) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_iter', 'menu': 'fn from_iter<I: IntoIterator<Item = &''a str>>(iter: I) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_iter', 'menu': 'fn from_iter<I: IntoIterator<Item = String>>(iter: I) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_iter', 'menu': 'fn from_iter<I: IntoIterator<Item = Cow<''a, str>>>(iter: I) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'Searcher', 'menu': 'type Searcher = <&''b str as Pattern<''a>>::Searcher;', 'info': '', 'kind': 't', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'default', 'menu': 'fn default() -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'Output', 'menu': 'type Output = String;', 'info': '', 'kind': 't', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'Output', 'menu': 'type Output = str;', 'info': '', 'kind': 't', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'Target', 'menu': 'type Target = str;', 'info': '', 'kind': 't', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'Err', 'menu': 'type Err = ParseError;', 'info': '', 'kind': 't', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from_str', 'menu': 'fn from_str(s: &str) -> Result<String, ParseError>', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from', 'menu': 'fn from(s: &''a str) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from', 'menu': 'fn from(s: Box<str>) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'from', 'menu': 'fn from(s: Cow<''a, str>) -> String', 'info': '', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
   \],
   \ ale#completion#ParseLSPCompletions({
   \   "jsonrpc":"2.0",
@@ -195,7 +195,7 @@ Execute(Should handle Python completion results correctly):
 
   AssertEqual
   \ [
-  \ {'word': 'what', 'menu': 'example-python-project.bar.Bar', 'info': "what()\n\n", 'kind': 'f', 'icase': 1},
+  \   {'word': 'what', 'menu': 'example-python-project.bar.Bar', 'info': "what()\n\n", 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
   \ ],
   \ ale#completion#ParseLSPCompletions({
   \    "jsonrpc":"2.0",
@@ -399,7 +399,7 @@ Execute(Should handle Python completion results correctly):
   \    }
   \ })
 
-Execute(Should handle Python completion results correctly):
+Execute(Should handle extra Python completion results correctly):
   let b:ale_completion_info = {
   \ 'completion_filter': 'ale#completion#python#CompletionItemFilter',
   \ 'prefix': 'mig',
@@ -407,8 +407,8 @@ Execute(Should handle Python completion results correctly):
 
   AssertEqual
   \ [
-  \   {'word': 'migrations', 'menu': 'xxx', 'info': 'migrations', 'kind': 'f', 'icase': 1},
-  \   {'word': 'MigEngine', 'menu': 'xxx', 'info': 'mig engine', 'kind': 'f', 'icase': 1},
+  \   {'word': 'migrations', 'menu': 'xxx', 'info': 'migrations', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
+  \   {'word': 'MigEngine', 'menu': 'xxx', 'info': 'mig engine', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
   \ ],
   \ ale#completion#ParseLSPCompletions({
   \   'jsonrpc': '2.0',
@@ -441,7 +441,7 @@ Execute(Should handle Python completion results correctly):
 Execute(Should handle missing keys):
   AssertEqual
   \ [
-  \   {'word': 'x', 'menu': '', 'info': '', 'kind': 'v', 'icase': 1},
+  \   {'word': 'x', 'menu': '', 'info': '', 'kind': 'v', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
   \ ],
   \ ale#completion#ParseLSPCompletions({
   \   'jsonrpc': '2.0',
@@ -459,7 +459,7 @@ Execute(Should handle missing keys):
 Execute(Should handle documentation in the markdown format):
   AssertEqual
   \ [
-  \   {'word': 'migrations', 'menu': 'xxx', 'info': 'Markdown documentation', 'kind': 'f', 'icase': 1},
+  \   {'word': 'migrations', 'menu': 'xxx', 'info': 'Markdown documentation', 'kind': 'f', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
   \ ],
   \ ale#completion#ParseLSPCompletions({
   \   'jsonrpc': '2.0',
@@ -483,7 +483,7 @@ Execute(Should handle documentation in the markdown format):
 Execute(Should handle completion messages with textEdit objects):
   AssertEqual
   \ [
-  \   {'word': 'next_callback', 'menu': 'PlayTimeCallback', 'info': '', 'kind': 'v', 'icase': 1},
+  \   {'word': 'next_callback', 'menu': 'PlayTimeCallback', 'info': '', 'kind': 'v', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
   \ ],
   \ ale#completion#ParseLSPCompletions({
   \   'id': 226,
@@ -514,7 +514,7 @@ Execute(Should handle completion messages with textEdit objects):
 Execute(Should handle completion messages with the deprecated insertText attribute):
   AssertEqual
   \ [
-  \   {'word': 'next_callback', 'menu': 'PlayTimeCallback', 'info': '', 'kind': 'v', 'icase': 1},
+  \   {'word': 'next_callback', 'menu': 'PlayTimeCallback', 'info': '', 'kind': 'v', 'icase': 1, 'user_data': json_encode({'_ale_completion_item': 1})},
   \ ],
   \ ale#completion#ParseLSPCompletions({
   \   'id': 226,
@@ -547,7 +547,8 @@ Execute(Should handle completion messages with additionalTextEdits when ale_comp
   \     'kind': 'v',
   \     'icase': 1,
   \     'user_data': json_encode({
-  \       'codeActions': [
+  \       '_ale_completion_item': 1,
+  \       'code_actions': [
   \         {
   \           'description': 'completion',
   \           'changes': [
@@ -658,6 +659,7 @@ Execute(Should still handle completion messages with empty additionalTextEdits w
   \     'info': '',
   \     'kind': 'v',
   \     'icase': 1,
+  \     'user_data': json_encode({'_ale_completion_item': 1}),
   \   }
   \ ],
   \ ale#completion#ParseLSPCompletions({
diff --git a/test/completion/test_tsserver_completion_parsing.vader b/test/completion/test_tsserver_completion_parsing.vader
index aaaaae95..231c0f95 100644
--- a/test/completion/test_tsserver_completion_parsing.vader
+++ b/test/completion/test_tsserver_completion_parsing.vader
@@ -90,6 +90,7 @@ Execute(TypeScript completion details responses should be parsed correctly):
   \     'info': '',
   \     'kind': 'v',
   \     'icase': 1,
+  \     'user_data': json_encode({'_ale_completion_item': 1}),
   \     'dup': g:ale_completion_autoimport,
   \   },
   \   {
@@ -98,6 +99,7 @@ Execute(TypeScript completion details responses should be parsed correctly):
   \     'info': 'foo bar baz',
   \     'kind': 'v',
   \     'icase': 1,
+  \     'user_data': json_encode({'_ale_completion_item': 1}),
   \     'dup': g:ale_completion_autoimport,
   \   },
   \   {
@@ -106,6 +108,7 @@ Execute(TypeScript completion details responses should be parsed correctly):
   \     'info': '',
   \     'kind': 'v',
   \     'icase': 1,
+  \     'user_data': json_encode({'_ale_completion_item': 1}),
   \     'dup': g:ale_completion_autoimport,
   \   },
   \ ],
@@ -179,7 +182,8 @@ Execute(Entries without details should be included in the responses):
   \     'kind': 'v',
   \     'icase': 1,
   \     'user_data': json_encode({
-  \         'codeActions': [{
+  \         '_ale_completion_item': 1,
+  \         'code_actions': [{
   \             'description': 'import { def } from "./Foo";',
   \             'changes': [],
   \         }],
@@ -192,6 +196,7 @@ Execute(Entries without details should be included in the responses):
   \     'info': 'foo bar baz',
   \     'kind': 'v',
   \     'icase': 1,
+  \     'user_data': json_encode({'_ale_completion_item': 1}),
   \     'dup': g:ale_completion_autoimport,
   \   },
   \   {
@@ -199,6 +204,7 @@ Execute(Entries without details should be included in the responses):
   \     'menu': '',
   \     'info': '',
   \     'kind': 'v',
+  \     'user_data': json_encode({'_ale_completion_item': 1}),
   \     'icase': 1,
   \   },
   \ ],
@@ -260,7 +266,8 @@ Execute(Default imports should be handled correctly):
   \     'kind': 't',
   \     'icase': 1,
   \     'user_data': json_encode({
-  \         'codeActions': [{
+  \         '_ale_completion_item': 1,
+  \         'code_actions': [{
   \             'description': 'Import default ''abcd'' from module "./foo"',
   \             'changes': [],
   \         }],
diff --git a/test/fix/test_ale_fix.vader b/test/fix/test_ale_fix.vader
index a51a5a53..128e3a14 100644
--- a/test/fix/test_ale_fix.vader
+++ b/test/fix/test_ale_fix.vader
@@ -196,6 +196,10 @@ After:
   " Clear the messages between tests.
   echomsg ''
 
+  if !exists('g:ale_command_wrapper')
+    let g:ale_command_wrapper = ''
+  endif
+
 Given testft (A file with three lines):
   a
   b
@@ -206,6 +210,13 @@ Execute(ALEFix should complain when there are no functions to call):
   call ale#test#FlushJobs()
   AssertEqual 'No fixers have been defined. Try :ALEFixSuggest', GetLastMessage()
 
+Execute(ALEFix should not complain when the command is run with a bang):
+  echom 'none'
+
+  ALEFix!
+  call ale#test#FlushJobs()
+  AssertEqual 'none', GetLastMessage()
+
 Execute(ALEFix should apply simple functions):
   let g:ale_fixers.testft = ['AddCarets']
   ALEFix
@@ -715,6 +726,19 @@ Execute(ale#fix#InitBufferData() should set up the correct data):
   \   'done': 0,
   \   'lines_before': ['a', 'b', 'c'],
   \   'should_save': 1,
+  \   'ignore_file_changed_errors': 0,
+  \ },
+  \}, g:ale_fix_buffer_data
+
+  call ale#fix#InitBufferData(bufnr(''), '!')
+
+  AssertEqual {
+  \ bufnr(''): {
+  \   'temporary_directory_list': [],
+  \   'done': 0,
+  \   'lines_before': ['a', 'b', 'c'],
+  \   'should_save': 0,
+  \   'ignore_file_changed_errors': 1,
   \ },
   \}, g:ale_fix_buffer_data
 
diff --git a/test/test_ale_lint_stop_command.vader b/test/test_ale_lint_stop_command.vader
new file mode 100644
index 00000000..c50db5a8
--- /dev/null
+++ b/test/test_ale_lint_stop_command.vader
@@ -0,0 +1,27 @@
+Before:
+  Save g:ale_buffer_info
+
+  let g:ale_buffer_info = {}
+
+  call ale#linter#PreventLoading('testft')
+  call ale#linter#Define('testft', {
+  \ 'name': 'testlinter',
+  \ 'callback': {-> []},
+  \ 'executable': has('win32') ? 'cmd' : 'true',
+  \ 'command': 'sleep 9001',
+  \})
+
+After:
+  Restore
+
+  call ale#linter#Reset()
+
+Given testft (An empty file):
+Execute(ALELintStop should stop ALE from linting):
+  ALELint
+
+  Assert ale#engine#IsCheckingBuffer(bufnr('')), 'ALE did not start checking the buffer'
+
+  ALELintStop
+
+  Assert !ale#engine#IsCheckingBuffer(bufnr('')), 'ALELintStop didn''t work'