Find and Grep share one +Search a directory, each run replacing the last

Each Grep with a new pattern opened another +Search, until the column
refused panes. Find and Grep now reuse their directory's one, as acme
reuses +Errors, and the exec reads back the pane it filled; a plain
word's LookWord list search keeps a pane a pattern as before.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/src/fs.zig b/src/fs.zig
index de02e8e8..6feaa972 100644
--- a/src/fs.zig
+++ b/src/fs.zig
@@ -1316,6 +1316,9 @@ pub const Namespace = struct {
     /// The serial of the pane the root's exec or look last ran a line at
     /// (the keyboard's), 0 before one: its err record names that pane.
     ran_at: u32 = 0,
+    /// The output pane a search just filled again rather than made
+    /// (Output.fillResults): what an exec reads back.
+    refilled: ?u32 = null,
     /// Every failure said (Messages.reportFailure), counted: a builtin
     /// that said one while it ran failed.
     failures: u32 = 0,