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, 67 insertions, 0 deletions

diff --git a/test/snapshots/headersweep.snap b/test/snapshots/headersweep.snap
new file mode 100644
index 00000000..be070357
--- /dev/null
+++ b/test/snapshots/headersweep.snap
@@ -0,0 +1,67 @@
+# A middle sweep over a column's tag or the workspace's runs what it swept,
+# as it does over a pane's tag: highlighted while the button is held, run
+# when it comes up. Both headers used to run the word under the PRESS, on
+# the press, so a sweep of `echo SWEPT-COL` ran a bare `echo`. A right sweep
+# looks for what it swept the same way, and the other button cancels.
+file hay.txt ZQNEEDLE
+start 21 120 -n 3
+wait 8000 Newcol
+stable 700 20000
+# the column tag: type a command onto it, then sweep the whole command
+press left 50 2
+release left 50 2
+key space
+text echo SW''EPT-COL
+key esc
+settle 100
+press middle @echo 2
+drag middle @echo+8 2
+stable 300 5000
+snapstyle col-sweeping
+drag middle @echo+16 2
+release middle @echo+16 2
+wait 8000 SWEPT-COL
+stable 700 15000
+snap col-swept
+# the workspace tag, the same
+press left 110 1
+release left 110 1
+key space
+text echo SW''EPT-WS
+key esc
+settle 100
+press middle @echo 1
+drag middle @echo+15 1
+release middle @echo+15 1
+wait 8000 SWEPT-WS
+stable 700 15000
+snap ws-swept
+# a right sweep over part of a word looks for the part: `hay.txt` opens,
+# where a click would look for all of `xxhay.txtxx`
+press left 118 1
+release left 118 1
+key space
+text xxhay.txtxx
+key esc
+settle 100
+press right @xxhay.txtxx+2 1
+drag right @xxhay.txtxx+9 1
+release right @xxhay.txtxx+9 1
+wait 8000 ZQNEEDLE
+stable 700 15000
+snap ws-looked
+# the look button tapped during a middle sweep cancels it: nothing runs
+press middle @echo 2
+drag middle @echo+16 2
+press right @echo+16 2
+release right @echo+16 2
+release middle @echo+16 2
+stable 700 15000
+snap cancelled
+# for comparison, a select sweep over the second column's tag selects, in
+# the tag's selection colours, and runs nothing
+press left @Find#2 2
+drag left @Grep#2+4 2
+release left @Grep#2+4 2
+stable 700 15000
+snapstyle selected