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use editor::scroll::autoscroll::Autoscroll;use gpui::ViewContext;use language::{Bias, Point};use workspace::Workspace; use crate::{normal::ChangeCase, state::Mode, Vim}; pub fn change_case(_: &mut Workspace, _: &ChangeCase, cx: &mut ViewContext<Workspace>) {    Vim::update(cx, |vim, cx| {        let count = vim.pop_number_operator(cx).unwrap_or(1) as u32;        vim.update_active_editor(cx, |editor, cx| {            let mut ranges = Vec::new();            let mut cursor_positions = Vec::new();            let snapshot = editor.buffer().read(cx).snapshot(cx);            for selection in editor.selections.all::<Point>(cx) {                match vim.state().mode {                    Mode::VisualLine => {                        let start = Point::new(selection.start.row, 0);                        let end =                            Point::new(selection.end.row, snapshot.line_len(selection.end.row));                        ranges.push(start..end);                        cursor_positions.push(start..start);                    }                    Mode::Visual | Mode::VisualBlock => {                        ranges.push(selection.start..selection.end);                        cursor_positions.push(selection.start..selection.start);                    }                    Mode::Insert | Mode::Normal => {                        let start = selection.start;                        let mut end = start;                        for _ in 0..count {                            end = snapshot.clip_point(end + Point::new(0, 1), Bias::Right);                        }                        ranges.push(start..end);                         if end.column == snapshot.line_len(end.row) {                            end = snapshot.clip_point(end - Point::new(0, 1), Bias::Left);                        }                        cursor_positions.push(end..end)                    }                }            }            editor.transact(cx, |editor, cx| {                for range in ranges.into_iter().rev() {                    let snapshot = editor.buffer().read(cx).snapshot(cx);                    editor.buffer().update(cx, |buffer, cx| {                        let text = snapshot                            .text_for_range(range.start..range.end)                            .flat_map(|s| s.chars())                            .flat_map(|c| {                                if c.is_lowercase() {                                    c.to_uppercase().collect::<Vec<char>>()                                } else {                                    c.to_lowercase().collect::<Vec<char>>()                                }                            })                            .collect::<String>();                         buffer.edit([(range, text)], None, cx)                    })                }                editor.change_selections(Some(Autoscroll::fit()), cx, |s| {                    s.select_ranges(cursor_positions)                })            });        });        vim.switch_mode(Mode::Normal, true, cx)    })}#[cfg(test)]mod test {    use crate::{state::Mode, test::NeovimBackedTestContext};     #[gpui::test]    async fn test_change_case(cx: &mut gpui::TestAppContext) {        let mut cx = NeovimBackedTestContext::new(cx).await;        cx.set_shared_state("ˇabC\n").await;        cx.simulate_shared_keystrokes(["~"]).await;        cx.assert_shared_state("AˇbC\n").await;        cx.simulate_shared_keystrokes(["2", "~"]).await;        cx.assert_shared_state("ABˇc\n").await;         // works in visual mode        cx.set_shared_state("a😀C«dÉ1*fˇ»\n").await;        cx.simulate_shared_keystrokes(["~"]).await;        cx.assert_shared_state("a😀CˇDé1*F\n").await;         // works with multibyte characters        cx.simulate_shared_keystrokes(["~"]).await;        cx.set_shared_state("aˇC😀é1*F\n").await;        cx.simulate_shared_keystrokes(["4", "~"]).await;        cx.assert_shared_state("ac😀É1ˇ*F\n").await;         // works with line selections        cx.set_shared_state("abˇC\n").await;        cx.simulate_shared_keystrokes(["shift-v", "~"]).await;        cx.assert_shared_state("ˇABc\n").await;         // works with multiple cursors (zed only)        cx.set_state("aˇßcdˇe\n", Mode::Normal);        cx.simulate_keystroke("~");        cx.assert_state("aSSˇcdˇE\n", Mode::Normal);    }}