desktop-locals-to-save

desktop-locals-to-save is a variable defined in `desktop.el'.
Its value is

(eww-history-position highlight-changes-mode desktop-locals-to-save truncate-lines case-fold-search case-replace fill-column overwrite-mode change-log-default-name line-number-mode column-number-mode size-indication-mode buffer-file-coding-system indent-tabs-mode tab-width indicate-buffer-boundaries indicate-empty-lines show-trailing-whitespace)

Original value was

(desktop-locals-to-save truncate-lines case-fold-search case-replace fill-column overwrite-mode change-log-default-name line-number-mode column-number-mode size-indication-mode buffer-file-coding-system indent-tabs-mode tab-width indicate-buffer-boundaries indicate-empty-lines show-trailing-whitespace)

Documentation:
List of local variables to save for each buffer.
The variables are saved only when they really are local. Conventional minor
modes are restored automatically; they should not be listed here.

You can customize this variable.