* Unfortunately not that easy to get right,
  especially the per-session .teco_ini.
* We must make sure that we do mung the $SCITECOCONFIG/.teco_ini.
* .teco_ini must always be munged even if .teco_session is not munged.

* The old heuristics - scroll if dot changes after key press -
  turned out to be too simplistic.
  They broke the clang-format macro (M#cf), which left the view at the
  top of the document since the entire document is temporarily erased.
  Other simplified examples of this bug would be:
  @^Um{[: HECcat$ ]:} Mm
  Or even: @^Um{[: H@X.aG.a ]:} Mm
* Actually, the heuristics could be tricked even without deleting any
  significant amount of text from the buffer.
  The following test case replaces the previous character with a linefeed
  in a single key press:
  @^Um{-DI^J$} Mm
  If executed on the last visible line, dot wouldn't be scrolled into the view
  since it did not change.
* At the same time, we'd like to keep the existing mouse scroll behavior from
  fnkeys.tes, which is allowed to scroll dot outside of the visible area.
  Therefore, dot is scrolled into view always, except after mouse events.
  You may have to call SCI_SCROLLCARET manually in the ^KMOUSE macro,
  which is arguably not always straight forward.
* Some macros like M#cf may still leave the vertical scrolling position
  in unexpected positions. This could either be fixed by eradicating all
  remaining automatic scrolling from Scintilla or by explicitly restoring
  the vertical position from the macro (FIXME).
* This was broken since the introduction of mouse support,
  so it wasn't in v2.3.0.

There are still some glitches with non-mainstream assemblers like A86, though.

They don't require Lexilla, so it makes no sense not to exclude them.

* This is rendered with ms, so we now need the entire groff on Debian.
  This is not a big deal as it just adds a few kilobytes of build-time dependencies.
  Most platforms do not allow installation of some "groff-base" package anyway
  and always draw in the entire package.
* sciteco.tmac has been extended to disable page breaks on ms.
* The tutorial is installed like any other woman page and can be invoked
  interactively with ?tutorial$.
* It is optimized to be still usable on a plain 80x24 terminal.

The trailing digits where cut off the filename.
E.g. when trying `sciteco test.f77:100`, we would open test.f on line 100 instead.

* Being able to embed null bytes into the lParam string is
  practically useless - there aren't any messages where this is useful
  and where there are no native SciTECO counterparts - so this case is now catched
  and the null-byte separates wParam from lParam.
* wParam can be the empty string, but it is not supported to pass wParam as a
  string and lParam as the empty string.
  If the second string argument ends in ^@, lParam is popped from the stack instead.
* This is a temporary workaround until we can properly parse the Scintilla.iface and
  generate more elegant per-message wrappers.
* It in particular unlocks the SCI_SETREPRESENTATION and SCI_SETPROPERTY messages.
  The former allows us to write a special hex-editor macro which sets hexadecimal
  character representations, while the latter allows you to set lexer properties.
* The C-based lexers ("cpp" in Lexilla) can now take preprocessor definitions into account.
  This is disabled by default, unless you set lexer.c.defines before opening a file.
  You can also set it interactively and re-set the lexer. For instance:
  ^U[lexer.c.defines]NDEBUG$ M[lexer.set.c]

* All commands and their documentations were inconsistent.
  * ^W rubbed out to the beginning of words.
  * Shift+Right (fnkeys.tes) moved to the beginning of the next word if
    invoked at the beginning of a word and to the end of the next word otherwise.
  * <W> (and <V> and <Y> by extension) moved to the end of the next word.
  * The cheat sheet would claim that <W> moves to the beginning of the next word.
* Video TECO's <W> command would differ again from everything else.
  With positive arguments, it moved to the beginning of words, while
  with negative it moved to end of words.
  I decided not to copy this behavior.
* It has been decided to adopt a consistent beginning-of-words policy.
  -W therefore differs from Video TECO in moving to the beginning of the
  current or previous word.
* teco_find_words() is now based on parsing the document pointer, instead
  of relying on SCI_WORDENDPOSITION, since the latter cannot actually be
  used to skip strictly non-word characters.
  This requires a constant amount of Scintilla messages but will require fewer
  messages only when moving for more than 3 words.
* The semantics of <W> are therefore now consistent with Vim and Emacs as well.
* Shift+Right/Left is still based on SCI_WORDENDPOSITION, so it's behavior
  differs slightly from <W> for instance at the end of lines, as it will
  stop at linebreaks.
* Unfortunately, these changes will break lots of macros, among others
  the M#rf, M#sp and git.blame macros ("Useful macros" from the wiki).

* You practically never want to indent in SciTECO code with hard tabs, as the hard tab is
  an insertion command.
* 2-char soft tabs are the convention in SciTECO's included macros.
* Fixes the M#it macro among other things.
* If you do want to insert an insertion-with-tab command (ASCII 9), you almost always will
  want to type it ^I instead.
  Real ASCII 9s should consequently be highlighted, ie. there should be a character representation.
  Unfortunately, character representations are currently set in C code and cannot be changed via <ES>.

These are all more or less plain text formats.