fix: only allow backslash as path separator in Windows in common.path_suggest (#1976)

data/core/common.lua

@@ -226,7 +226,12 @@ function common.path_suggest(text, root)
   if root and root:sub(-1) ~= PATHSEP then
     root = root .. PATHSEP
   end
-  local path, name = text:match("^(.-)([^"..PATHSEP.."/]*)$")
+
+  local pathsep = PATHSEP
+  if PLATFORM == "Windows" then
+    pathsep = "\\/"
+  end
+  local path = text:match("^(.-)[^"..pathsep.."]*$")
   local clean_dotslash = false
   -- ignore root if path is absolute
   local is_absolute = common.is_absolute_path(text)