Del and Delcol refuse unsaved text once, as acme's do

acme's Del asks winclean first and Delcol colclean (exec.c del, delcol):
unsaved text is warned about, and the same word again closes. pardes closed
at once. Both now refuse once through the one-warning-per-word mechanism
Exit uses, from keys, tags, exec and ctl alike. A pane dirty only by a
rename, or an empty one that never held a file, has no text to lose and is
not asked about, and a scratch or a command's output under 100 bytes is not
either, as acme's winclean passes a small unnamed window.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

2 files changed, 10 insertions, 4 deletions

diff --git a/docs/fs.md b/docs/fs.md
index 5093e754..c257a55d 100644
--- a/docs/fs.md
+++ b/docs/fs.md
@@ -119,10 +119,11 @@ every setting is one, the rest act on a pane). `/ctl` takes the session's
 builtins, one a line, at whichever pane has the keyboard as each runs --
 `Newcol`, `Dump`, `Mount name dial`, `Theme ink`, `Verbose off`; `Exit`,
 which quits the editor as acme's does (it refuses once, naming each pane with
-unsaved text, a `+New` scratch with text in it too, in one line,
+unsaved text, a `+New` scratch of 100 bytes or more too, in one line,
 `<name>, <name>: Modified (Exit again to discard)`, and a second `Exit`
-with nothing edited since quits, throwing that text away; a command's
-output under 100 bytes is not asked about; `Restore`, which replaces every pane,
+with nothing edited since quits, throwing that text away; a scratch or a
+command's output under 100 bytes is not asked about, as acme's winclean
+asks about no small unnamed window; `Restore`, which replaces every pane,
 asks the same first -- `Dump` writes `pardes-<date>-<time>.zon` (UTC) in
 `DumpDir` (default `$XDG_DATA_HOME/pardes`, else `~/.local/share/pardes`)
 and logs `dump <path>`, and `Restore` with no path takes the last one; a
diff --git a/docs/tags.md b/docs/tags.md
index e6ec0585..f622520f 100644
--- a/docs/tags.md
+++ b/docs/tags.md
@@ -60,7 +60,12 @@ to its `ctl`, they step the body back and forward through its edits, as the
 `u` and `U` keys do. They are not in the default tags.
 
 `Del` closes a pane and gives its rows to one neighbor; the rest of the
-column keeps its heights. `Del k` (or `DelAbove`) gives them to the nearest
+column keeps its heights. A pane with unsaved text is refused once, as
+acme's Del warns (exec.c del, wind.c winclean): `<name>: Modified (Del again
+to discard)`, and the same `Del` again, nothing edited since, closes it and
+throws the text away; `Delcol` refuses a column holding such a pane the same
+way (exec.c delcol). Each word warns on its own, from a key, a tag, `exec`
+or a ctl, where the refusal fails the write with EIO. `Del k` (or `DelAbove`) gives them to the nearest
 expanded pane above, `Del j` (or `DelBelow`) to the one below, each falling
 back to the other side. Bare `Del` from the keyboard (`SPC d`, or Enter on
 the word) on a pane with expanded panes both above and below asks on the