Make a pane's tag a Text edited with the body's own keys

The tag was a fixed buffer with its own one-line editor, a cursor measured
across the path, and a hijack of the body's mode while it was typed into.
It is now the pane's second Text: its own characters after the computed
prefix (path, dirty marker, PDF page), which is never stored in it, so a
rename or a dirty marker never moves its cursor. Normal and insert mode are
the body's, undo included; `:` moves the keyboard between body and tag, the
tag remembers its cursor and starts on Save, and executing a word from it
hands the keyboard back. The mouse still sees the prefix: a sweep selects
across it and a click on the path drafts a new name.

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

1 files changed, 3 insertions, 3 deletions

diff --git a/src/Pipe.zig b/src/Pipe.zig
index 3e6752a8..4cabfd88 100644
--- a/src/Pipe.zig
+++ b/src/Pipe.zig
@@ -294,12 +294,12 @@ test "selection pipe prompt submits exact request and Escape cancels" {
     pane.body.vsel = .{ .active = true, .row = 0, .col = 0, .explicit = true };
 
     p.update(.{ .key = .{ .cp = '|' } });
-    try std.testing.expect(!pane.tag_edit and pane.prompt == .pipe);
+    try std.testing.expect(pane.focus == .body and pane.prompt == .pipe);
     try std.testing.expectEqualStrings(config.pipe_marker, pane.promptText().?);
     try std.testing.expect(nextPipeEffect(p) == null);
     p.update(.{ .key = .{ .cp = 't', .text = "tr a-z A-Z" } });
     p.update(.{ .key = .{ .cp = Key.enter } });
-    try std.testing.expect(!pane.tag_edit and pane.prompt != .pipe and pane.input.own == null);
+    try std.testing.expect(pane.focus == .body and pane.prompt != .pipe and pane.input.own == null);
     const id = nextPipeEffect(p) orelse return error.MissingPipeEffect;
     const request = p.pipe.pipeRequest(id) orelse return error.MissingPipeRequest;
     try std.testing.expectEqualStrings("tr a-z A-Z", request.command);
@@ -311,7 +311,7 @@ test "selection pipe prompt submits exact request and Escape cancels" {
     p.update(.{ .key = .{ .cp = '|' } });
     p.update(.{ .key = .{ .cp = 'c', .text = "cat" } });
     p.update(.{ .key = .{ .cp = Key.escape } });
-    try std.testing.expect(!pane.tag_edit and pane.prompt != .pipe);
+    try std.testing.expect(pane.focus == .body and pane.prompt != .pipe);
     try std.testing.expectEqualSlices(u8, before, pane.file.?.content);
     try std.testing.expect(nextPipeEffect(p) == null);
 }