make sure the cursor doesn't move when removing tailing whitespaces

lua/conf/autos.lua

@@ -31,7 +31,11 @@ auto('BufRead', {
 auto('BufWritePre', {
   group = fsmod,
   desc = 'remove trailing spaces on file save',
-  command = [[%s/\s\+$//e]]
+  callback = function()
+    local pos = vim.api.nvim_win_get_cursor(0)
+    vim.cmd([[%s/\s\+$//e]])
+    vim.api.nvim_win_set_cursor(0, pos)
+  end
 })
 
 auto('BufWritePre', {