Add a command for stopping all LSP clients

autoload/ale/lsp/reset.vim

@@ -0,0 +1,25 @@
+" Stop all LSPs and remove all of the data for them.
+function! ale#lsp#reset#StopAllLSPs() abort
+    call ale#lsp#StopAll()
+
+    if exists('*ale#definition#ClearLSPData')
+        " Clear the mapping for connections, etc.
+        call ale#definition#ClearLSPData()
+    endif
+
+    if exists('*ale#engine#ClearLSPData')
+        " Clear the mapping for connections, etc.
+        call ale#engine#ClearLSPData()
+
+        " Remove the problems for all of the LSP linters in every buffer.
+        for l:buffer_string in keys(g:ale_buffer_info)
+            let l:buffer = str2nr(l:buffer_string)
+
+            for l:linter in ale#linter#Get(getbufvar(l:buffer, '&filetype'))
+                if !empty(l:linter.lsp)
+                    call ale#engine#HandleLoclist(l:linter.name, l:buffer, [])
+                endif
+            endfor
+        endfor
+    endif
+endfunction