Use range positions to determine insert_newline motion (helix-editor#…

…9448)

* use anchor and head positions to determine motion

* use range cursor to decide extending or shifting

* add condition to cursor moving back on normal

helix-term/src/commands.rs

@@ -3664,7 +3664,7 @@ pub mod insert {
                 (pos, pos, local_offs)
             };
 
-            let new_range = if doc.restore_cursor {
+            let new_range = if range.cursor(text) > range.anchor {
                 // when appending, extend the range by local_offs
                 Range::new(
                     range.anchor + global_offs,

helix-view/src/editor.rs

@@ -1993,10 +1993,12 @@ impl Editor {
         if doc.restore_cursor {
             let text = doc.text().slice(..);
             let selection = doc.selection(view.id).clone().transform(|range| {
-                Range::new(
-                    range.from(),
-                    graphemes::prev_grapheme_boundary(text, range.to()),
-                )
+                let mut head = range.to();
+                if range.head > range.anchor {
+                    head = graphemes::prev_grapheme_boundary(text, head);
+                }
+
+                Range::new(range.from(), head)
             });
 
             doc.set_selection(view.id, selection);