#3599 - Use ale_root instead of ale_lsp_root

The `ale_lsp_root` setting is now deprecated, and `ale_root` should be
used instead. The setting will be used for both setting the root easily
for LSP linters, and for running other linters over whole projects.

autoload/ale/assert.vim

@@ -265,11 +265,11 @@ function! ale#assert#SetUpLinterTest(filetype, name) abort
     call ale#linter#Reset()
     call ale#linter#PreventLoading(a:filetype)
 
-    Save g:ale_lsp_root
-    let g:ale_lsp_root = {}
+    Save g:ale_root
+    let g:ale_root = {}
 
-    Save b:ale_lsp_root
-    unlet! b:ale_lsp_root
+    Save b:ale_root
+    unlet! b:ale_root
 
     call ale#assert#ResetVariables(a:filetype, a:name)
 

autoload/ale/debugging.vim

@@ -33,13 +33,13 @@ let s:global_variable_list = [
 \    'ale_list_vertical',
 \    'ale_list_window_size',
 \    'ale_loclist_msg_format',
-\    'ale_lsp_root',
 \    'ale_max_buffer_history_size',
 \    'ale_max_signs',
 \    'ale_maximum_file_size',
 \    'ale_open_list',
 \    'ale_pattern_options',
 \    'ale_pattern_options_enabled',
+\    'ale_root',
 \    'ale_set_balloons',
 \    'ale_set_highlights',
 \    'ale_set_loclist',

autoload/ale/lsp_linter.vim

@@ -201,7 +201,11 @@ function! ale#lsp_linter#GetConfig(buffer, linter) abort
 endfunction
 
 function! ale#lsp_linter#FindProjectRoot(buffer, linter) abort
-    let l:buffer_ale_root = getbufvar(a:buffer, 'ale_lsp_root', {})
+    let l:buffer_ale_root = getbufvar(
+    \   a:buffer,
+    \   'ale_root',
+    \   getbufvar(a:buffer, 'ale_lsp_root', {})
+    \)
 
     if type(l:buffer_ale_root) is v:t_string
         return l:buffer_ale_root
@@ -218,9 +222,15 @@ function! ale#lsp_linter#FindProjectRoot(buffer, linter) abort
         endif
     endif
 
+    let l:global_root = g:ale_root
+
+    if empty(g:ale_root) && exists('g:ale_lsp_root')
+        let l:global_root = g:ale_lsp_root
+    endif
+
     " Try to get a global setting for the root
-    if has_key(g:ale_lsp_root, a:linter.name)
-        let l:Root = g:ale_lsp_root[a:linter.name]
+    if has_key(l:global_root, a:linter.name)
+        let l:Root = l:global_root[a:linter.name]
 
         if type(l:Root) is v:t_func
             return l:Root(a:buffer)