Introduce DisplayRow, MultiBufferRow newtypes and BufferRow type alias (#11656)

Part of https://github.com/zed-industries/zed/issues/8081

To avoid confusion and bugs when converting between various row `u32`'s,
use different types for each.
Further PRs should split `Point` into buffer and multi buffer variants
and make the code more readable.

Release Notes:

- N/A

---------

Co-authored-by: Piotr <piotr@zed.dev>

crates/vim/src/utils.rs

@@ -3,6 +3,7 @@ use std::time::Duration;
 use editor::{ClipboardSelection, Editor};
 use gpui::{ClipboardItem, ViewContext};
 use language::{CharKind, Point};
+use multi_buffer::MultiBufferRow;
 use settings::Settings;
 
 use crate::{state::Mode, UseSystemClipboard, Vim, VimSettings};
@@ -74,10 +75,10 @@ fn copy_selections_content_internal(
             // contains a newline (so that delete works as expected). We undo that change
             // here.
             let is_last_line = linewise
-                && end.row == buffer.max_buffer_row()
+                && end.row == buffer.max_buffer_row().0
                 && buffer.max_point().column > 0
-                && start.row < buffer.max_buffer_row()
-                && start == Point::new(start.row, buffer.line_len(start.row));
+                && start.row < buffer.max_buffer_row().0
+                && start == Point::new(start.row, buffer.line_len(MultiBufferRow(start.row)));
 
             if is_last_line {
                 start = Point::new(start.row + 1, 0);
@@ -96,7 +97,7 @@ fn copy_selections_content_internal(
             clipboard_selections.push(ClipboardSelection {
                 len: text.len() - initial_len,
                 is_entire_line: linewise,
-                first_line_indent: buffer.indent_size_for_line(start.row).len,
+                first_line_indent: buffer.indent_size_for_line(MultiBufferRow(start.row)).len,
             });
         }
     }