A tag that exactly fills its row stays one row, as acme's does

Tags wrapped one cell early to keep a cell for the caret past a full row,
so a tag that exactly filled its column broke as De / l. acme's frame wraps
a box only when it is wider than what the row has left, and frptofchar
clamps the tick past a full line's end to the frame's edge. Tags now wrap
at their full width; the caret past a full row sits at the tag layer's
edge, and on the pane's last cell in a terminal grid, which has none past
it. Two tiny-screen tests collapse their tags, as the others do, and the 41
goldens that moved were re-recorded by name after the same check: rows
shift back up under the shorter tags and nothing else changes. chordcut's
file-body clicks moved back with them.

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

1 files changed, 5 insertions, 3 deletions

diff --git a/src/tagline.zig b/src/tagline.zig
index 68fa2645..d024be4e 100644
--- a/src/tagline.zig
+++ b/src/tagline.zig
@@ -286,10 +286,12 @@ pub fn wrapTag(arena: std.mem.Allocator, whole: []const u8, width: usize) !Shown
     return .{ .text = out.items, .soft = soft.items };
 }
 
-/// The tag's width for wrapping: its columns, one kept for the caret past
-/// a full row's end.
+/// The tag's width for wrapping: all its columns. A row the text fills
+/// exactly stays one row, as acme's frame wraps a box only when it is wider
+/// than what is left (libframe frutil.c _frcklinewrap), and the caret past
+/// its end sits at the edge (frptofchar.c clamps it to r.max.x).
 pub fn tagWidth(p: *const Pardes, id: usize) usize {
-    return @max(1, @as(usize, p.tagCapacity(p.rects[id].w -| TAG_TEXT_INSET)) -| 1);
+    return @max(1, @as(usize, p.tagCapacity(p.rects[id].w -| TAG_TEXT_INSET)));
 }
 
 pub fn shownTag(p: *Pardes, arena: std.mem.Allocator, pane: *Pane) !Shown {