Improve Ctrl+Left-Arrow Keys behavior (#1531)

* Improve Ctrl+Left-Arrow Keys behavior

* Add CHANGELOG entry

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Features/Changes
 
+- [#1531](https://github.com/lapce/lapce/pull/1531): Improved Ctrl+Left command on spaces at the beginning of a line
 - [#1491](https://github.com/lapce/lapce/pull/1491): Added Vim shift+c to delete remainder of line
 - [#1508](https://github.com/lapce/lapce/pull/1508): Show in progress when Lapce is self updating
 - [#1475](https://github.com/lapce/lapce/pull/1475): Add editor setting: "Cursor Surrounding Lines" which sets minimum number of lines above and below cursor
@@ -106,4 +107,4 @@
 - [#1191](https://github.com/lapce/lapce/pull/1191): Tone down default inlay hint background color in Lapce dark theme
 - [#1227](https://github.com/lapce/lapce/pull/1227): Don't restore cursor mode on undo
 - [#1413](https://github.com/lapce/lapce/pull/1413): Disable format-on-save by default. Remember to re-enable this if you want it!
-- [#1404](https://github.com/lapce/lapce/pull/1404): Log panics with full backtrace as error
+- [#1404](https://github.com/lapce/lapce/pull/1404): Log panics with full backtrace as error

lapce-core/src/word.rs

@@ -78,6 +78,14 @@ pub fn prev_boundary(&mut self) -> Option<usize> {
                 if classify_boundary(prop_prev, prop).is_start() {
                     break;
                 }
+
+                // Stop if line beginning reached, without any non-whitespace characters
+                if prop_prev == CharClassification::Lf
+                    && prop == CharClassification::Space
+                {
+                    break;
+                }
+
                 prop = prop_prev;
                 candidate = self.inner.pos();
             }
@@ -469,6 +477,14 @@ fn prev_boundary_should_be_at_word_start() {
         assert_eq!(boundary, Some(6));
     }
 
+    #[test]
+    fn on_whitespace_prev_boundary_should_be_at_line_start() {
+        let rope = Rope::from("Hello\n    world");
+        let mut cursor = WordCursor::new(&rope, 10);
+        let boundary = cursor.prev_boundary();
+        assert_eq!(boundary, Some(6));
+    }
+
     #[test]
     fn should_get_next_word_boundary() {
         let rope = Rope::from("Hello world");