review pass: fix the eaten Tab, drop the duplicated code, cover the gaps

1 files changed, 45 insertions, 0 deletions

diff --git a/test/snapshots/tagalign2col.snap b/test/snapshots/tagalign2col.snap
new file mode 100644
index 00000000..02add6fd
--- /dev/null
+++ b/test/snapshots/tagalign2col.snap
@@ -0,0 +1,45 @@
+# The shared tail-end is scoped to a LAYOUT COLUMN. tagalign.snap proves the
+# sharing but only ever has one column, so nothing there would notice a vote
+# that leaked sideways: every pane in the window would still line up, and the
+# feature would look like it worked right up until you opened a second column.
+#
+# Here the long path is in the LEFT column (that is which side it lands on:
+# `SPC c n` puts the NEW column on the right, so the boot file keeps the left)
+# and the right column is a plain shell. Both columns are 80 wide, so both
+# would end their words at tag_right_pad — 58 columns in — if nothing pushed.
+dirmk deep
+dirmk deep/proj
+file deep/proj/document.txt alpha\nbeta\ngamma
+start 30 160 deep/proj/document.txt
+wait 8000 New Newcol
+wait 8000 document.txt
+stable 700 20000
+# `SPC c n`: a shell in a column of its own on the right. Two columns, one pane
+# each. The file's own tag is 69 columns and so pushes past its column's pad;
+# the shell on the right sits AT its pad, 58 in. Read the two ends off this
+# snap — they are what the next one must not disturb.
+key space c n
+stable 700 15000
+key space w h
+stable 400 5000
+snap onecol
+# Alt-n: a second pane in the LEFT column. It is 41 columns of tag and would
+# right-align at 58 on its own; the file above it drags it out to 69 instead.
+# THE ASSERTION: the right column's `New Del` has not moved a cell — same
+# absolute column as in `onecol`, still at its own pad — while the left
+# column's two rows now agree with each other at 69.
+key a-n
+stable 700 15000
+snap aligned
+# ...and the ends are computed per column, not once for the window. Drag the
+# vertical border 20 columns right: the left column grows to 100 (tw-pad 78 is
+# now past the file's 69, so its pad binds again and both left rows move OUT to
+# 78) and the right column shrinks to 60 (tw-pad 38 is now short of the shell's
+# own 41, so its words fall back hard against the path at 41). Two different
+# rules firing in the same frame, one per column — a single window-wide end
+# could not produce this grid at all.
+press left 80 10
+drag left 100 10
+release left 100 10
+stable 700 15000
+snap widened