A middle or right sweep over a column's or the workspace's tag runs or looks for what it swept, as a pane tag's does

Both headers acted on the press: a middle or right press ran, or looked
for, the word under it (or the header's selection when it was on that) at
once, so a drag had nothing left to do. A sweep of `echo SWEPT` in a column
tag ran a bare `echo`. They have done so since the headers were drawn apart
from the panes; it is no regression, and the -l/Restore allocator fix
(ompukopz) does not touch it.

Now a press on a header holds a HeaderSweep (the column by its serial, or
the workspace), which the drag extends, held to the header's row and text
as a pane tag's sweep is. It is painted in its button's tint meanwhile, and
the release runs what it swept in that header's context; a release that has
not moved runs the word or selection a click always did. The other of
middle and right cancels it (acme 2-3/3-2); the select button is inert, as
a header's command already takes the held selection as its argument.

Running on the release, a builtin from a header is announced as one from a
pane tag is: the press used to set the announcement and the release clear it
at once. find, restore, theme, topbarexec, ttyhelp, tutor and windowops
re-recorded for that badge alone.

headersweep.snap sweeps the column and workspace tags with the middle
button and a word part with the right one, and cancels a sweep;
headersweep-restored.snap sweeps both after Dump and Restore.

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

1 files changed, 24 insertions, 2 deletions

diff --git a/src/draw.zig b/src/draw.zig
index ad24153f..0ea0b35e 100644
--- a/src/draw.zig
+++ b/src/draw.zig
@@ -1109,8 +1109,9 @@ fn renderHeaderLayer(p: *Pardes, arena: std.mem.Allocator, layer: *pardes.Layer,
         // The word under the pointer, a Look or Exec target: on a header even
         // while it is edited, on a notice, and on the grid's copy of either
         // (joined from this); not on a column a carried column's pointer is
-        // aiming at a place over.
-        const hovered = p.pointer_inside and !(kind == .column and p.drag == .column_move);
+        // aiming at a place over; nor under a held middle or right sweep,
+        // which paints what it sweeps instead.
+        const hovered = p.pointer_inside and !(kind == .column and p.drag == .column_move) and p.header_sweep == null;
         if (hovered) {
             const tag_hit = p.pointer_tag_hit;
             const col: ?usize = if (tag_hit) |pointer|
@@ -1141,6 +1142,27 @@ fn renderHeaderLayer(p: *Pardes, arena: std.mem.Allocator, layer: *pardes.Layer,
             const asking = if (p.panes[p.active]) |active| active.prompt != .none else false;
             if (!asking and t.cur_row == line + p.header_top and caret < columns) layer.cursor = .{ .x = @intCast(caret), .y = line, .bar = t.mode == .insert };
         }
+        // A middle or right sweep held over this header, tinted by its
+        // button as a pane tag's is.
+        if (p.header_sweep) |sweep| if (sweep.column(p)) |column| {
+            const mine = switch (kind) {
+                .workspace => column == null,
+                .column => column == id,
+                .pane, .notice, .body => false,
+            };
+            const swept = sweep.span(text.len);
+            const start = modal.lineStartOffset(text, index + top);
+            const end = start + shown.len;
+            if (mine and swept.lo < swept.hi and swept.hi > start and swept.lo < end) {
+                const button = @intFromEnum(sweep.button);
+                var col = panes.File.rawDisplayCol(shown, @max(swept.lo, start) - start) -| scroll;
+                const stop = panes.File.rawDisplayCol(shown, @min(swept.hi, end) - start) -| scroll;
+                while (col < stop and col < columns) : (col += 1) {
+                    surface.at(@intCast(col), 0).style.bg = .{ .rgb = body_layer.buttonTints(p.theme())[button] };
+                    surface.at(@intCast(col), 0).style.fg = .{ .rgb = body_layer.buttonInks(p.theme())[button] };
+                }
+            }
+        } else |_| {};
     }
 }