Give prompts their own line to type into instead of the tag's tail

A search, pipe or Save prompt wrote its marker and answer onto the end of
the tag, so the tag's cursor, its selection, its 9P writes and a prompt
abandoned by a click all shared one buffer: the abandoned text stayed in
the tag and a 9P write landed inside the prompt. The answer is now its own
Text on the pane, typed in insert mode and shown on the notice band where
it was already drawn, and the tag never holds any of it.

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

1 files changed, 4 insertions, 5 deletions

diff --git a/test/snapshots/tagbottomshort.snap b/test/snapshots/tagbottomshort.snap
index 2574df36..58da6a87 100644
--- a/test/snapshots/tagbottomshort.snap
+++ b/test/snapshots/tagbottomshort.snap
@@ -10,8 +10,8 @@ wait 8000 s.txt
 stable 700 20000
 key space t b
 stable 700 15000
-# `/` with room to spare: the prompt is cut off the tagline (grid 9) and drawn
-# on grid 8, the last body row, with the cursor.
+# `/` with room to spare: the prompt is its own line, drawn on grid 8, the last
+# body row, with the cursor; the tagline (grid 9) never holds any of it.
 key /
 send ZZ
 stable 600 8000
@@ -27,9 +27,8 @@ resize 4 80
 stable 700 10000
 snap one-body
 # the tagline alone. No body row, so nothing of the prompt is drawn anywhere —
-# not over the tag, not on the row above the pane. The tagline itself is
-# untouched: the marker sits after the builtins, so cutting the tail there
-# leaves every column of it exactly as `tag-only` would look unarmed.
+# not over the tag, not on the row above the pane, and its caret with it. The
+# tagline itself is untouched, exactly as `tag-only` would look unarmed.
 resize 2 80
 stable 700 10000
 snap tag-only