A column can be empty, as acme's can; new panes go where acme's makenewwindow puts them

Newcol makes an empty column; closing a column's last pane leaves it empty with
the keyboard on its tag; Delcol and Joincol alone take a column away; the
session's last pane closing quits. The +New stand-in and replaceStillborn /
stillborn_joiner are gone. Every new pane goes through exec.placeNew, which
follows acme's makenewwindow (active column, empty column whole, blank space,
halving the biggest) or, with Placement pardes, the old rules. ColumnTags is
gone: column tags are always shown. A grip drag shows acme's box cursor.

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

1 files changed, 6 insertions, 11 deletions

diff --git a/src/look.zig b/src/look.zig
index 020aacb8..b6a89b64 100644
--- a/src/look.zig
+++ b/src/look.zig
@@ -1251,20 +1251,15 @@ pub fn lookAt(p: *Pardes, id: usize, operand: []const u8) void {
             const free = p.freeSlot() orelse return p.reportError(id, "look", error.NoPaneSlots);
             const nt = p.newShell(free, dir) catch |err| return p.reportError(id, "look", err);
             nt.greet = true;
-            const src = layout.splitParent(p, id);
-            const f = layout.findPane(p, src).?;
-            layout.insert(p, f.col, f.idx + 1, free);
-            layout.splitBelow(p, src, nt);
-            p.active = free;
-            p.stillborn_joiner = nt.serial;
+            exec.placeNew(p, id, id, free, .shell);
         },
         .file => |target| {
             if (comptime pdf_enabled) if (target.kind == .pdf) {
                 if (focusPaneByPath(p, target.path, target.at)) return;
                 const free = p.freeSlot() orelse return p.reportError(id, "look", error.NoPaneSlots);
-                const nt = panes.Pdf.openPane(p, free, target.path, target.at.line) catch |err|
+                _ = panes.Pdf.openPane(p, free, target.path, target.at.line) catch |err|
                     return p.reportError(id, "look", err);
-                exec.placeDoc(p, id, free, nt);
+                exec.placeNew(p, id, id, free, .doc);
                 return;
             };
             // focus an existing pane on this path (rescrolled), else open
@@ -1273,7 +1268,7 @@ pub fn lookAt(p: *Pardes, id: usize, operand: []const u8) void {
             const nt = panes.File.open(p, free, target.path, target.at.line) catch |err|
                 return p.reportError(id, "look", err);
             if (target.at.col > 0) nt.body.cur_col = @intCast(target.at.col - 1);
-            exec.placeDoc(p, id, free, nt);
+            exec.placeNew(p, id, id, free, .doc);
             layout.compute(p);
             nt.file.?.scroll -|= @max(1, p.rects[free].h -| BOX_H) / 2;
             if (target.at.end_line != 0) {
@@ -1285,9 +1280,9 @@ pub fn lookAt(p: *Pardes, id: usize, operand: []const u8) void {
         .image => |target| {
             if (focusPaneByPath(p, target.path, .{})) return;
             const free = p.freeSlot() orelse return p.reportError(id, "look", error.NoPaneSlots);
-            const nt = panes.Image.create(p, free, target.path, &.{}) catch |err|
+            _ = panes.Image.create(p, free, target.path, &.{}) catch |err|
                 return p.reportError(id, "look", err);
-            exec.placeDoc(p, id, free, nt);
+            exec.placeNew(p, id, id, free, .doc);
         },
     }
 }