A column can be empty, as acme's can; new panes go where acme's makenewwindow puts them

Newcol makes an empty column; closing a column's last pane leaves it empty with
the keyboard on its tag; Delcol and Joincol alone take a column away; the
session's last pane closing quits. The +New stand-in and replaceStillborn /
stillborn_joiner are gone. Every new pane goes through exec.placeNew, which
follows acme's makenewwindow (active column, empty column whole, blank space,
halving the biggest) or, with Placement pardes, the old rules. ColumnTags is
gone: column tags are always shown. A grip drag shows acme's box cursor.

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

1 files changed, 5 insertions, 3 deletions

diff --git a/docs/config.md b/docs/config.md
index 16fd59e5..77ed68e7 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -111,9 +111,11 @@ themes and all imported names remain available.
 `FocusTint` toggles the focused pane and column tag tints; it is on by default.
 Workspace, column and pane command text can be edited directly; see
 [editable tags](tags.md) for naming and saved-workspace behavior.
-`ColumnTags` toggles the column command row in both GUI and TTY; it is on by
-default. Add `ColumnTags` to startup configuration to reclaim that row on a
-compact screen. Hiding it preserves your custom column commands.
+The column command row is always shown; an old `ColumnTags` init line is
+ignored with a message.
+`Placement acme` (the default) puts new panes where acme would, in the active
+column; `Placement pardes` brings back pardes's own rules, which open a first
+document in a column of its own. See [where new panes go](tags.md#where-new-panes-go).
 `Verbose` toggles the message-row announcement every builtin makes of its own
 name before it runs; it is on by default, and the builtins that own the message
 row themselves (`Msg`) never announce. Turning it off leaves the row to the