- fixed 'I' command in normal mode not moving to exact start of line

src/prompt/readline/linebuf.rs

@@ -2055,9 +2055,10 @@ impl LineBuf {
       }
       MotionCmd(_, Motion::BeginningOfFirstWord) => {
         let start = self.start_of_line();
-        let mut indices = self.directional_indices_iter_from(start, Direction::Forward);
+        self.update_graphemes_lazy();
+        let indices = self.grapheme_indices().to_vec();
         let mut first_graphical = None;
-        while let Some(idx) = indices.next() {
+        for &idx in indices.iter().skip(start) {
           let grapheme = self.grapheme_at(idx).unwrap();
           if !is_whitespace(grapheme) {
             first_graphical = Some(idx);

src/tests/readline.rs

@@ -174,6 +174,10 @@ impl LineWriter for TestWriter {
   fn flush_write(&mut self, _buf: &str) -> libsh::error::ShResult<()> {
     Ok(())
   }
+
+	fn send_bell(&mut self) -> ShResult<()> {
+		Ok(())
+	}
 }
 
 // NOTE: FernVi structure has changed significantly and readline() method no
@@ -598,6 +602,50 @@ fn editor_delete_line_up() {
 	)
 }
 
+#[test]
+fn editor_insert_at_line_start() {
+  // I should move cursor to position 0 when line starts with non-whitespace
+  assert_eq!(
+    normal_cmd("I", "hello world", 5),
+    ("hello world".into(), 0)
+  );
+  // I should skip leading whitespace
+  assert_eq!(
+    normal_cmd("I", "  hello world", 8),
+    ("  hello world".into(), 2)
+  );
+  // I should move to the first non-whitespace on the current line in a multiline buffer
+  assert_eq!(
+    normal_cmd("I", "first line\nsecond line", 14),
+    ("first line\nsecond line".into(), 11)
+  );
+  // I should land on position 0 when cursor is already at 0
+  assert_eq!(
+    normal_cmd("I", "hello", 0),
+    ("hello".into(), 0)
+  );
+}
+
+#[test]
+fn editor_f_char_from_position_zero() {
+  // f<char> at position 0 should skip the cursor and find the next occurrence
+  // Regression: previously at pos 0, f would match the char under the cursor itself
+  assert_eq!(
+    normal_cmd("fa", "abcaef", 0),
+    ("abcaef".into(), 3) // should find second 'a', not the 'a' at position 0
+  );
+  // f<char> from position 0 finding a char that only appears later
+  assert_eq!(
+    normal_cmd("fo", "hello world", 0),
+    ("hello world".into(), 4)
+  );
+  // f<char> from middle of buffer
+  assert_eq!(
+    normal_cmd("fd", "hello world", 5),
+    ("hello world".into(), 10)
+  );
+}
+
 // NOTE: These tests disabled because fernvi_test() helper is commented out
 /*
 #[test]