fix(#48): preserve window views of formatted buffers

lua/guard/format.lua

@@ -21,11 +21,27 @@ local function ignored(buf, patterns)
   return false
 end
 
+local function save_views(bufnr)
+  local views = {}
+  for _, win in ipairs(vim.fn.win_findbuf(bufnr)) do
+    views[win] = api.nvim_win_call(win, vim.fn.winsaveview)
+  end
+  return views
+end
+
+local function restore_views(views)
+  for win, view in pairs(views) do
+    api.nvim_win_call(win, function()
+      vim.fn.winrestview(view)
+    end)
+  end
+end
+
 local function update_buffer(bufnr, new_lines, srow, erow)
   if not new_lines or #new_lines == 0 then
     return
   end
-  local view = vim.fn.winsaveview()
+  local views = save_views(bufnr)
 
   local prev_lines = vim.api.nvim_buf_get_lines(bufnr, srow, erow, true)
   new_lines = vim.split(new_lines, '\n')
@@ -63,7 +79,7 @@ local function update_buffer(bufnr, new_lines, srow, erow)
   if mode == 'v' or 'V' then
     vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes('<Esc>', true, false, true), 'n', true)
   end
-  vim.fn.winrestview(view)
+  restore_views(views)
 end
 
 local function find(startpath, patterns, root_dir)