A pane whose whole text fits in its rows never scrolls to keep a margin

The scroll margin reveals text; with none off screen there is nothing to
reveal. ensureCursorVisible and a centred look both leave such a pane at its
top. A longer file keeps helix's clamp (hxdiff and hxparity unchanged).

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

1 files changed, 1 insertions, 15 deletions

diff --git a/test/snapshots/lsp-client.golden b/test/snapshots/lsp-client.golden
index e4ea4c90..17eb0d40 100644
--- a/test/snapshots/lsp-client.golden
+++ b/test/snapshots/lsp-client.golden
@@ -25,19 +25,5 @@
 |20:      5 main.rs:5:13-15
 |21:      6     let y = add(3, 4);
 |22:      7
-== snap gr-opened grid=100x25 cursor=21,6
-|3:      2
-|4:      3 fn main() {
-|5:      4     let x = add(1, 2);
-|6:      5     let y = add(3, 4);
-|7:      6     let _ = x + y;
-|8:      7 }
-|9:      8
+== snap gr-opened grid=100x25 cursor=21,7
 == snap gr-back grid=100x25 cursor=21,6
-|3:      1 mod lib;
-|4:      2
-|5:      3 fn main() {
-|6:      4     let x = add(1, 2);
-|7:      5     let y = add(3, 4);
-|8:      6     let _ = x + y;
-|9:      7 }