Update cursor correctly when inserting newlines

core/src/editor_buffer/mod.rs

@@ -98,9 +98,26 @@ impl EditorBuffer {
     }
 
     fn insert_char(&self, c: char) -> CommandResult {
+        let newline = c == '\n';
         CommandResult::ok(Self {
             buffer: self.buffer.insert_char(c, self.cursor),
-            cursor: self.cursor.advance(),
+            cursor: match self.cursor {
+                Point::Start => {
+                    if newline {
+                        Point::LineColumn(1, 0)
+                    } else {
+                        Point::LineColumn(0, 1)
+                    }
+                }
+                Point::LineColumn(line, column) => {
+                    if newline {
+                        Point::LineColumn(line + 1, 0)
+                    } else {
+                        Point::LineColumn(line, column + 1)
+                    }
+                }
+                Point::End => Point::End,
+            },
             ..self.clone()
         })
     }

core/src/text_buffer/mod.rs

@@ -26,16 +26,6 @@ pub enum Point {
     End,
 }
 
-impl Point {
-    pub fn advance(self) -> Self {
-        match self {
-            Self::Start => Self::LineColumn(0, 1),
-            Self::LineColumn(l, c) => Self::LineColumn(l, c + 1),
-            Self::End => Self::End,
-        }
-    }
-}
-
 impl TextBuffer {
     /// Create a new empty [TextBuffer]
     pub fn new() -> Self {