+Errors with no room anywhere logs its text rather than fail the Edit

Edit's p and = put their output in +Errors, and when its column had no
room the placement refusal failed the whole Edit. +Errors now tries every
column with room, the last first, and with none its text is logged as msg
records, a line each; the Edit succeeds.

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

1 files changed, 26 insertions, 3 deletions

diff --git a/src/exec.zig b/src/exec.zig
index 0a7e71f9..bb4309a4 100644
--- a/src/exec.zig
+++ b/src/exec.zig
@@ -851,9 +851,32 @@ pub fn placeNew(p: *Pardes, from: usize, origin: ?usize, id: usize, kind: NewPan
         layout.snapColWeights(p, f.col);
         if (!layout.splitTallest(p, f.col, id) or !layout.placedRoomy(p, id, &before)) {
             if (layout.findPane(p, id) == null) layout.insert(p, f.col, p.col_n[f.col], id);
-            p.unplaced.set(id);
-            p.reportError(from, "placement", error.NoPaneRoom);
-            return;
+            // +Errors goes wherever there is room, last column first; with
+            // none, its maker says the text some other way (appendErrors).
+            if (kind == .errors) {
+                layout.removePane(p, id);
+                var c = p.ncol;
+                while (c > 0) {
+                    c -= 1;
+                    if (c == f.col) continue;
+                    for (p.col_panes[c][0..p.col_n[c]]) |k| p.rects[k] = before[k];
+                    layout.snapColWeights(p, c);
+                    if (p.col_n[c] == 0) {
+                        layout.insert(p, c, 0, id);
+                        break;
+                    }
+                    if (layout.splitTallest(p, c, id) and layout.placedRoomy(p, id, &before)) break;
+                    if (layout.findPane(p, id) != null) layout.removePane(p, id);
+                } else {
+                    layout.insert(p, f.col, p.col_n[f.col], id);
+                    p.unplaced.set(id);
+                    return;
+                }
+            } else {
+                p.unplaced.set(id);
+                p.reportError(from, "placement", error.NoPaneRoom);
+                return;
+            }
         }
     };
     if (kind == .command) return;