check item type before creating input text (#1904)

* check item type before creating input text

* Update data/plugins/treeview.lua

Co-authored-by: Takase <20792268+takase1121@users.noreply.github.com>

* Update data/plugins/treeview.lua

Co-authored-by: Takase <20792268+takase1121@users.noreply.github.com>

---------

Co-authored-by: FloppyDisco <joshuapaulpiasecki@gmail.com>
Co-authored-by: Takase <20792268+takase1121@users.noreply.github.com>

data/plugins/treeview.lua

@@ -746,7 +746,12 @@ command.add(
   ["treeview:new-file"] = function(item)
     local text
     if not is_project_folder(item.abs_filename) then
+      if item.type == "dir" then
         text = item.filename .. PATHSEP
+      elseif item.type == "file" then
+        local parent_dir = common.dirname(item.filename)
+        text = parent_dir and parent_dir .. PATHSEP
+      end
     end
     core.command_view:enter("Filename", {
       text = text,
@@ -768,7 +773,12 @@ command.add(
   ["treeview:new-folder"] = function(item)
     local text
     if not is_project_folder(item.abs_filename) then
+      if item.type == "dir" then
         text = item.filename .. PATHSEP
+      elseif item.type == "file" then
+        local parent_dir = common.dirname(item.filename)
+        text = parent_dir and parent_dir .. PATHSEP
+      end
     end
     core.command_view:enter("Folder Name", {
       text = text,