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, 0 deletions

diff --git a/src/memory.zig b/src/memory.zig
index 7b6ee2c0..abfd40f6 100644
--- a/src/memory.zig
+++ b/src/memory.zig
@@ -17,6 +17,9 @@ pub const limits = struct {
     pub const wrap_rows = if (board) 128 else 256;
     pub const undo_max = if (board) 16 else 256;
     pub const message_log = if (board) 16 else 128;
+    /// ranges one selection holds; helix has no limit, and a `%s` over a
+    /// file's words wants hundreds
+    pub const selections = if (board) 64 else 1024;
     /// /log's ring, which records whether or not anyone reads it.
     pub const log_bytes: usize = if (board) 4 * KiB else 64 * KiB;
     pub const max_tag_tail: usize = if (board) 512 else 4096;
@@ -187,6 +190,7 @@ test "memory limits preserve desktop capacities" {
     try std.testing.expectEqual(256, limits.wrap_rows);
     try std.testing.expectEqual(256, limits.undo_max);
     try std.testing.expectEqual(128, limits.message_log);
+    try std.testing.expectEqual(1024, limits.selections);
     try std.testing.expectEqual(@as(usize, 4096), limits.max_tag_tail);
     try std.testing.expectEqual(@as(usize, 4095), limits.host_path_cap);
     try std.testing.expectEqual(config.embed_sources, limits.embedded_sources);