fix(windows): handle Windows file paths correctly in refile (#1042)

* fix(windows): handle Windows file paths correctly in refile

There was a bug on Windows where the first character of the file name was dropped during refile. This happened because an extra leading / was added to the beginning of the path, resulting in something like: `/C:/org/file.org` which was then displayed as: `ile.org`.

Some issue was reported in #911, but not fixed on Windows.

* apply reviewer suggestion for Windows path handling

Co-authored-by: Kristijan Husak <[email protected]>

---------

Co-authored-by: Kristijan Husak <[email protected]>

Author: allhearingeye

lua/orgmode/utils/fs.lua

@@ -111,7 +111,10 @@ function M.trim_common_root(paths)
     end, paths)
   end
 
-  local root = '/' .. table.concat(common_root, '/') .. '/'
+  local root = table.concat(common_root, '/') .. '/'
+  if vim.fn.has('win32') == 0 then
+    root = '/' .. root
+  end
   local result = {}
   for _, path in ipairs(paths) do
     local relative_path = path:sub(#root + 1)