Remove dead code

The height method on FontMetrics is not needed anymore. We call `text_size` nowadays.

sixtyfps_runtime/corelib/graphics.rs

@@ -135,10 +135,6 @@ pub trait FontMetrics {
     /// for example when receiving a mouse click into a text field. Then this function returns the "cursor"
     /// position.
     fn text_offset_for_x_position<'a>(&self, text: &'a str, x: f32) -> usize;
-    /// Returns the height of the font. This is typically the sum of the ascent and the descent, resulting
-    /// in the height that can fit the talltest glyphs of the font. Note that it is possible though that
-    /// the font may include glyphs that exceed this.
-    fn height(&self) -> f32;
 }
 
 #[cfg(feature = "ffi")]

sixtyfps_runtime/rendering_backends/gl/lib.rs

@@ -1420,18 +1420,6 @@ impl FontMetrics for GLFontMetrics {
         }
         return text.len();
     }
-
-    fn height(&self) -> f32 {
-        self.shared_data
-            .canvas
-            .borrow_mut()
-            .measure_font(self.font().init_paint(
-                self.request.letter_spacing.unwrap_or_default(),
-                femtovg::Paint::default(),
-            ))
-            .unwrap()
-            .height()
-    }
 }
 
 impl GLFontMetrics {

sixtyfps_runtime/rendering_backends/qt/qt_window.rs

@@ -1075,12 +1075,6 @@ impl sixtyfps_corelib::graphics::FontMetrics for QFont {
             return QStringView(string).left(cur).toUtf8().size();
         }}
     }
-
-    fn height(&self) -> f32 {
-        cpp! { unsafe [self as "const QFont*"] -> f32 as "float"{
-            return QFontMetricsF(*self).height();
-        }}
-    }
 }
 
 thread_local! {