From a76ec9a64e6c505ee0fdd5ee18e83390ac4a84ad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bla=C5=BE=20Hrastnik?= <blaz@mxxn.io>
Date: Fri, 20 Aug 2021 13:42:01 +0900
Subject: [PATCH] Make scrolling extend in extend mode

---
 helix-term/src/commands.rs | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index 7c3eeb4c1..e7f482dd5 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -882,12 +882,11 @@ fn switch_to_lowercase(cx: &mut Context) {
 pub fn scroll(cx: &mut Context, offset: usize, direction: Direction) {
     use Direction::*;
     let (view, doc) = current!(cx.editor);
-    let cursor = coords_at_pos(
-        doc.text().slice(..),
-        doc.selection(view.id)
-            .primary()
-            .cursor(doc.text().slice(..)),
-    );
+
+    let range = doc.selection(view.id).primary();
+    let text = doc.text().slice(..);
+
+    let cursor = coords_at_pos(text, range.cursor(text));
     let doc_last_line = doc.text().len_lines().saturating_sub(1);
 
     let last_line = view.last_line(doc);
@@ -917,11 +916,16 @@ pub fn scroll(cx: &mut Context, offset: usize, direction: Direction) {
         .max(view.offset.row + scrolloff)
         .min(last_line.saturating_sub(scrolloff));
 
-    let text = doc.text().slice(..);
-    let pos = pos_at_coords(text, Position::new(line, cursor.col), true); // this func will properly truncate to line end
+    let head = pos_at_coords(text, Position::new(line, cursor.col), true); // this func will properly truncate to line end
+
+    let anchor = if doc.mode == Mode::Select {
+        range.anchor
+    } else {
+        head
+    };
 
     // TODO: only manipulate main selection
-    doc.set_selection(view.id, Selection::point(pos));
+    doc.set_selection(view.id, Selection::single(anchor, head));
 }
 
 fn page_up(cx: &mut Context) {