editor: Represent scroll offset with more precision (#39367)

Closes #5355

Release Notes:

- Fixed rendering glitches with files with more than 16 million lines
(that occured due to floating number rounding errors).

---------

Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>

crates/vim/src/normal/scroll.rs

@@ -121,9 +121,9 @@ fn scroll_editor(
     let amount = match (amount.is_full_page(), editor.visible_line_count()) {
         (true, Some(visible_line_count)) => {
             if amount.direction().is_upwards() {
-                ScrollAmount::Line(amount.lines(visible_line_count) + 1.0)
+                ScrollAmount::Line((amount.lines(visible_line_count) + 1.0) as f32)
             } else {
-                ScrollAmount::Line(amount.lines(visible_line_count) - 1.0)
+                ScrollAmount::Line((amount.lines(visible_line_count) - 1.0) as f32)
             }
         }
         _ => amount,
@@ -308,7 +308,7 @@ mod test {
         let window = cx.window;
         let margin = cx
             .update_window(window, |_, window, _cx| {
-                window.viewport_size().height - line_height * visible_line_count
+                window.viewport_size().height - line_height * visible_line_count as f32
             })
             .unwrap();
         cx.simulate_window_resize(