A B1 sweep held past a pane's edge scrolls the body, as acme's frselect does

Dragging a selection beyond the top or bottom of a pane stopped at the last visible row. Now, while B1 is held past the body's top or bottom (at a pane that reaches the screen's bottom, its last row, since the pointer cannot leave the screen), the body scrolls a line a tick; the sweep's start keeps its place in the text, and a sweep that scrolled ends as the text's own selection. Also here: a ctrl-click is not half a double-click (lspdebug's golden stays as it was), and a test that clicks many points in a row resets the double-click between them.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/docs/selections.md b/docs/selections.md
index 7ec58f2b..0817c215 100644
--- a/docs/selections.md
+++ b/docs/selections.md
@@ -141,3 +141,10 @@ B1-B3 pastes over it. Everything done while B1 stays down is one undo
 step, as acme marks the file once per B1 hold (text.c:881, textselect), so
 B1-B2 then B1-B3 is a copy: the text cut and pasted back, the cut text
 left in the register.
+
+A B1 sweep held past a pane's top (on its tag) or bottom (past it, or on
+its last row when the pane reaches the screen's bottom, which the pointer
+cannot leave) scrolls the body a line a tick, as acme's frselect scrolls,
+the sweep's end under the pointer and its start on its text. A sweep that
+scrolled ends as the text's own selection, from where it began to where it
+ended. B2 and B3 sweeps do not scroll.