Cleanup doc-strings.
Cleanup doc-strings.
Cleanup defcustom tags.
Rename from `folio-page-scan-follow-point-p'.
Cleanup defcustom tags.
Move keymap.
Add the `folio-image-mode-p' predicate.
Add support for the page scan display following point in the text
buffer, allow for window configuration changes and window or frame
resize events.  This mode is controlled by the
`folio-page-scan-follows-point-p' defcustom.