A selection holds up to 1024 ranges on the desktop, 64 on the board

The limit was 64 everywhere, which helix-golf's enumerate_and_align outgrows
(%s |\d+ makes 121 ranges). It is now memory.limits.selections, per platform,
and the counts that hold it are u16. The ranges stay inline in each Text, so a
pane grows by about 80 KiB on the desktop (three texts and the regex prompt's
snapshot); the Pane size budget in Terminal.zig moves from 128 to 160 KiB and
says why.

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

1 files changed, 4 insertions, 1 deletions

diff --git a/src/Terminal.zig b/src/Terminal.zig
index 4f94533d..1ff561b1 100644
--- a/src/Terminal.zig
+++ b/src/Terminal.zig
@@ -545,7 +545,10 @@ test "replay ownership is terminal-only and construction rolls back on allocatio
             try std.testing.expectEqual(terminal and enabled, pane.terminal != null);
         }
     };
-    try std.testing.expect(@sizeOf(Pane) < 128 * 1024);
+    // Most of it is the three texts' selections, limits.selections ranges
+    // each held inline (about 20 KiB a text on the desktop), and the regex
+    // prompt's snapshot of them.
+    try std.testing.expect(@sizeOf(Pane) < 160 * 1024);
     try std.testing.checkAllAllocationFailures(std.testing.allocator, Case.run, .{false});
     try std.testing.checkAllAllocationFailures(std.testing.allocator, Case.run, .{true});
 }