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]>

5 files changed, 19 insertions, 76 deletions

diff --git a/test/snapshots/find.golden b/test/snapshots/find.golden
index 50557fad..e6e1bac1 100644
--- a/test/snapshots/find.golden
+++ b/test/snapshots/find.golden
@@ -65,15 +65,9 @@
 |12:    /tmp/pardes-snap/find/cwd/sub/nest/zqmark-gamma.txt Save Tty Collapse Del
 |13:      1 gamma body
 == snap third grid=120x41 cursor=7,16
-|6:      2 sub/nest/zqmark-gamma.txt
-|7:      3 zqmark-alpha.txt
-|8:      4
 |15:    /tmp/pardes-snap/find/cwd/zqmark-alpha.txt Save Tty Collapse Del
 |16:      1 alpha body
 == snap back grid=120x41 cursor=7,13
-|6:      1 sub/ZQMARK-beta.txt
-|7:      2 sub/nest/zqmark-gamma.txt
-|8:      3 zqmark-alpha.txt
 == snap word grid=120x41 cursor=7,13
 |3:      1 Find                                                                                                        Find
 |4:                                                                                                                  Find /
@@ -81,11 +75,8 @@
 |3:      1 Find                                                                                                      Find /
 |4:
 |13:      1 gamma body                                                                                                  Last
-== snap nomatch grid=120x41 cursor=7,7
+== snap nomatch grid=120x41 cursor=7,8
 |3:      1 Find
-|6:      2 sub/nest/zqmark-gamma.txt
-|7:      3 zqmark-alpha.txt
-|8:      4
 |13:      1 gamma body
 |18:    /tmp/pardes-snap/find/cwd/+Search Save Tty Collapse Del
 |19:      1
diff --git a/test/snapshots/lookrange.golden b/test/snapshots/lookrange.golden
index 19a83f2c..7d802b0b 100644
--- a/test/snapshots/lookrange.golden
+++ b/test/snapshots/lookrange.golden
@@ -85,37 +85,11 @@
 |19: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-9 #e5eee5,#0d1410, 10-15 #f7e4a5,#5e4923, 16-18 #e5eee5,#0d1410, 19-149 d,#0d1410,
 |20: 0-0 d,#608269, 1-1 d,#0d1410, 2-18 #59675c,#0d1410, 19-149 d,#0d1410,
 |21: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-11 #e5eee5,#0d1410, 12-17 #f7e4a5,#5e4923, 18-149 d,#0d1410,
-== snap hit2 grid=150x31 cursor=17,12
-|8:      4 dddd
-|9:      5 eeee
-|10:      6 ffff
-|11:      7 gg NEEDLE gg
-|12:      8 hhhh NEEDLE
-|13:      9 iiii
-|14:
-|15:
-|16:
+== snap hit2 grid=150x31 cursor=17,15
 == style hit2 grid=150x31
-|8: 0-0 d,#152019, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-10 #e5eee5,#0d1410, 11-149 d,#0d1410,
-|9: 0-0 d,#152019, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-10 #e5eee5,#0d1410, 11-149 d,#0d1410,
-|10: 0-0 d,#152019, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-10 #e5eee5,#0d1410, 11-149 d,#0d1410,
-|11: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-18 #e5eee5,#0d1410, 19-149 d,#0d1410,
-|12: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #616f64,#0d1410,b 7-11 #e5eee5,#0d1410, 12-17 #f5f7ee,#3c614a, 18-149 d,#0d1410,
-|14: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-149 d,#0d1410,
-|15: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-149 d,#0d1410,
-|16: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-149 d,#0d1410,
-== snap back grid=150x31 cursor=15,12
-|8:      3 cccc dccc
-|9:      4 dddd
-|10:      5 eeee
-|11:      6 ffff
-|12:      7 gg NEEDLE gg
-|13:      8 hhhh NEEDLE
-|14:      9 iiii
+|14: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-18 #e5eee5,#0d1410, 19-149 d,#0d1410,
+|15: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #616f64,#0d1410,b 7-11 #e5eee5,#0d1410, 12-17 #f5f7ee,#3c614a, 18-149 d,#0d1410,
+== snap back grid=150x31 cursor=15,14
 == style back grid=150x31
-|8: 0-0 d,#152019, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-15 #e5eee5,#0d1410, 16-149 d,#0d1410,
-|10: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-10 #e5eee5,#0d1410, 11-149 d,#0d1410,
-|11: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-10 #e5eee5,#0d1410, 11-149 d,#0d1410,
-|12: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #616f64,#0d1410,b 7-9 #e5eee5,#0d1410, 10-15 #f5f7ee,#3c614a, 16-18 #e5eee5,#0d1410, 19-149 d,#0d1410,
-|13: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-17 #e5eee5,#0d1410, 18-149 d,#0d1410,
-|14: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-10 #e5eee5,#0d1410, 11-149 d,#0d1410,
+|14: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #616f64,#0d1410,b 7-9 #e5eee5,#0d1410, 10-15 #f5f7ee,#3c614a, 16-18 #e5eee5,#0d1410, 19-149 d,#0d1410,
+|15: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-17 #e5eee5,#0d1410, 18-149 d,#0d1410,
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 }
diff --git a/test/snapshots/rsearch.golden b/test/snapshots/rsearch.golden
index 6e078612..872693bb 100644
--- a/test/snapshots/rsearch.golden
+++ b/test/snapshots/rsearch.golden
@@ -17,17 +17,14 @@
 |14:      3 code.txt:3:1-7
 |15:      4 count_x again
 |16:      5
-== snap select grid=210x31 cursor=14,9
-|7:      2 open sub/dep.txt:3 here
-|8:      3 count_x again
-|9:      4 pick two words
+== snap select grid=210x31 cursor=14,10
 |10: ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌
 |16:    /tmp/pardes-snap/rsearch/cwd/+Search Save Tty Collapse Del LocationsConfig
 |17:      1 code.txt:4:1-8
 |18:      2 pick two words
 |19:      3
 == snap path-open grid=210x31 cursor=7,22
-|10:
+|10:      4 pick two words
 |19:    /tmp/pardes-snap/rsearch/cwd/sub/dep.txt Save Tty Collapse Del
 |20:      1 d1
 |21:      2 d2
@@ -36,10 +33,6 @@
 |24:      5 d5
 |25:      6 d6
 == snap step1 grid=210x31 cursor=13,9
-|7:      1 run count_x now
-|8:      2 open sub/dep.txt:3 here
-|9:      3 count_x again
-|10:      4 pick two words
 == snap step2 grid=210x31 cursor=13,9
 == snap step3 grid=210x31 cursor=13,9
 == snap selclick grid=210x31 cursor=14,10
diff --git a/test/snapshots/rsearch.snap b/test/snapshots/rsearch.snap
index d880e557..0ce257bd 100644
--- a/test/snapshots/rsearch.snap
+++ b/test/snapshots/rsearch.snap
@@ -50,17 +50,16 @@ snap select
 # right-CLICK the path `sub/dep.txt:3` (line 2, col 18): isFileChar keeps / . :
 # so the click expands the whole token and it RESOLVES — a look, not a search —
 # opening dep.txt scrolled to line 3 (DEPTARGET). The "don't break paths" case.
-press right 18 8
-release right 18 8
+press right 18 9
+release right 18 9
 wait 10000 DEPTARGET
 stable 700 15000
 snap path-open
 # A click does not merely LIST the hits, it goes to one: this re-search of
-# `count_x` (line 3, col 12: acme sized code.txt to its four lines, and the
-# first search scrolled line 1 off) also STEPS onto hit 1, so the cursor lands
-# in the match, not where the click was.
-press right 12 9
-release right 12 9
+# `count_x` (line 1, col 15) also STEPS onto hit 1, so the cursor lands in the
+# match, not where the click was.
+press right 15 8
+release right 15 8
 stable 700 15000
 snap step1
 # ...and the same word clicked in its OTHER place (line 3, col 10) opens NO
@@ -75,9 +74,9 @@ press right 10 10
 release right 10 10
 stable 700 15000
 snap step3
-# acme sized code.txt to its four lines, and on so tight a pane a click on
-# line 4 scrolls it to keep its context rows: drag its last row (the resize
-# handle) down four rows first, so the rows below stay where they are clicked.
+# acme sized code.txt to its four lines, so line 4 is on its last row, and a
+# pane's last row is its resize handle: a press there would drag the seam, not
+# sweep text. Drag that handle down four rows first.
 press left 40 11
 drag left 40 15
 release left 40 15