Give more incidental motivation for improving on page-break-lines

1 files changed, 17 insertions, 10 deletions

diff --git a/itches/emacs/form-feed.md b/itches/emacs/form-feed.md
index 3f0ca91..fd60dd4 100644
--- a/itches/emacs/form-feed.md
+++ b/itches/emacs/form-feed.md
@@ -50,20 +50,27 @@ This hypothetical thin-line display could be re-used by e.g.:
 
 - `eldoc-doc-buffer-separator`.
 
-(See [emacs-devel][emacs-devel-thin-line] for a list of use-cases for
-thin lines, form-feed-related or not.)
-
-Full disclosure
-:   This reflection started because moving over this underlined space
-    with `truncate-lines` on caused the screen to jump horizontally.
-    This specific problem was fixed without dragging FORM FEED display
-    into the discussion, but I feel like the latter is the more
-    interesting issue ([who on Earth] enables `truncate-lines` by
-    default anyway).
+See [emacs-devel][emacs-devel-thin-line] for a list of use-cases for
+thin lines, form-feed-related or not.
 
 [`page-break-lines`]: https://github.com/purcell/page-break-lines
 [junk]: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=41250#89
 [emacs-devel-thin-line]: https://lists.gnu.org/archive/html/emacs-devel/2019-05/msg00268.html
+
+## Incidental motivation
+
+This reflection started because moving over this underlined space with
+`truncate-lines` on caused the screen to jump horizontally.  This
+specific problem was fixed without dragging FORM FEED display into the
+discussion, but I feel like the latter is the more interesting issue
+([who on Earth] enables `truncate-lines` by default anyway).
+
+Also `page-break-lines` breaks down in a couple of scenarios
+(e.g. form feeds embedded in diffs shown in Gnus or Magit; somehow
+vc-diff seems to fare better).  Those could probably be fixed, but it
+feels like effort would be better spent improving core, for the
+reasons given above.
+
 [who on Earth]: https://git.kevinlegouguec.net/dotfiles/tree/.emacs-custom.el
 
 ## Scratch pad