[Feature Request] Ignore some folder

[Mlk1225]

• Maybe Ignore some folder paths and let them not expand？

  • for some folders are used to store attachments, and when there are many attachments (such as 3000+), expanding such folders will cause obvious lag.

• Perhaps by adding a mode differentiation

  • Like "Normal Expansion Mode" (expand some folders) and "Force Expansion Mode" (expand all folders)