Use builtin font for box drawing unicode characters

This commit adds hand rolled drawing of unicode box drawing[1] and
block elements[2] from ranges U+2500 up to U+259f. While using system
font for such characters will look better most of the time, the
characters tend to overlap or not align, so providing builtin font is
the lesser evil here.

[1] - https://www.unicode.org/charts/PDF/U2500.pdf
[2] - https://www.unicode.org/charts/PDF/U2580.pdf

Fixes alacritty#5485.

CHANGELOG.md

@@ -37,6 +37,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Display area keeps history position when viewport is cleared
 - Commands spawn from the current directory of the foreground shell in Unix-like systems
 - Remove trailing newline from strings taken from hints or simple/semantic selections
+- Builtin font is now used for box drawing characters from `U+2500` to `U+259f`
 
 ### Fixed
 

alacritty/src/display/mod.rs

@@ -537,7 +537,7 @@ impl Display {
                     lines.update(&cell);
 
                     // Draw the cell.
-                    api.render_cell(cell, glyph_cache);
+                    api.draw_cell(cell, glyph_cache);
                 }
             });
         }
@@ -606,7 +606,7 @@ impl Display {
             for (i, message_text) in text.iter().enumerate() {
                 let point = Point::new(start_line + i, Column(0));
                 self.renderer.with_api(config, &size_info, |mut api| {
-                    api.render_string(glyph_cache, point, fg, bg, message_text);
+                    api.draw_string(glyph_cache, point, fg, bg, message_text);
                 });
             }
         } else {
@@ -756,7 +756,7 @@ impl Display {
         let bg = config.colors.search_bar_background();
 
         self.renderer.with_api(config, size_info, |mut api| {
-            api.render_string(glyph_cache, point, fg, bg, &text);
+            api.draw_string(glyph_cache, point, fg, bg, &text);
         });
     }
 
@@ -774,7 +774,7 @@ impl Display {
         let bg = config.colors.normal.red;
 
         self.renderer.with_api(config, size_info, |mut api| {
-            api.render_string(glyph_cache, point, fg, bg, &timing);
+            api.draw_string(glyph_cache, point, fg, bg, &timing);
         });
     }
 
@@ -797,7 +797,7 @@ impl Display {
         if obstructed_column.map_or(true, |obstructed_column| obstructed_column < column) {
             let glyph_cache = &mut self.glyph_cache;
             self.renderer.with_api(config, size_info, |mut api| {
-                api.render_string(glyph_cache, Point::new(0, column), fg, bg, &text);
+                api.draw_string(glyph_cache, Point::new(0, column), fg, bg, &text);
             });
         }
     }