fix: use cell-edge diagonals for diff gap hatching

src/tui.rs

@@ -1297,7 +1297,7 @@ fn draw_diff_pane(
             let buffer = frame.buffer_mut();
             for x in 0..content.width {
                 buffer[(content.x + x, row_area.y)]
-                    .set_symbol("/")
+                    .set_symbol("╱")
                     .set_style(style);
             }
             continue;
@@ -2567,7 +2567,7 @@ mod tests {
         let gap_symbols: Vec<_> = (after.x + 1..after.right() - 1)
             .map(|x| {
                 let cell = &buffer[(x, y)];
-                assert_eq!(cell.symbol(), "/");
+                assert_eq!(cell.symbol(), "╱");
                 assert_eq!(cell.bg, Color::Reset);
                 assert_eq!(cell.fg, Color::Rgb(72, 72, 72));
                 cell.symbol().to_owned()
@@ -2617,7 +2617,7 @@ mod tests {
             let y = before.y + 1 + offset;
             for x in before.x + 1..before.right() - 1 {
                 let cell = &buffer[(x, y)];
-                assert_eq!(cell.symbol(), "/");
+                assert_eq!(cell.symbol(), "╱");
                 assert_eq!(cell.bg, Color::Reset);
                 assert_eq!(cell.fg, Color::Rgb(72, 72, 72));
             }
@@ -2637,7 +2637,7 @@ mod tests {
         render_diff(&mut terminal, &diff, &mut panels);
         let buffer = terminal.backend().buffer();
         for x in before.x + 1..before.right() - 1 {
-            assert_eq!(buffer[(x, before.y + 1)].symbol(), "/");
+            assert_eq!(buffer[(x, before.y + 1)].symbol(), "╱");
         }
         assert_eq!(buffer[(before.x, before.y + 1)].symbol(), "│");
         assert_eq!(buffer[(before.right() - 1, before.y + 1)].symbol(), "│");