size says its limits, keeps every pane its rows, and ptys follow their panes

size refused an out-of-range line without saying the range, took a size
too small for the panes (leaving bodies of no rows), and a terminal
squeezed to its tag kept a pty of its old size. The refusal now names
20x6 to 4096x4096 (a bare size is EINVAL like any malformed line), a size
that would leave any pane less than its tag and 2 rows is refused and
undone, and a terminal's pty is resized with its pane down to one row
(only a folded or unplaced one keeps its grid).

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

1 files changed, 4 insertions, 1 deletions

diff --git a/src/pardes.zig b/src/pardes.zig
index 72fd4d46..c103b9d7 100644
--- a/src/pardes.zig
+++ b/src/pardes.zig
@@ -6527,7 +6527,10 @@ pub const Pardes = struct {
             } else pane.tag_top = 0;
             const cols = @max(1, r.w -| config.GUTTER);
             const rows = @max(1, r.h -| pane.tag_rows); // the tag steals the top rows
-            if ((cols != pane.cols or rows != pane.rows) and r.h > pane.tag_rows) {
+            // A terminal's pty follows its pane down to a row, whatever the
+            // resize; only a folded one keeps the size it had, and one not
+            // placed yet the grid it was made with.
+            if ((cols != pane.cols or rows != pane.rows) and (r.h > pane.tag_rows or (pane.isTerminal() and !pane.collapsed and r.h > 0))) {
                 // doc panes have no pty/emulator grid to reflow; just record
                 // the size so bodyText renders the right number of rows
                 if (pane.isTerminal()) {