Merge branch 'text-width' into 'master'

Fix the text width measurement for the bitmap font

See merge request redox-os/orbtk!91

src/backend/orbital/mod.rs

@@ -42,7 +42,7 @@ impl FontMeasure for OrbFontMeasure {
             return (text.width(), text.height())
         } 
 
-        (text.len() as u32 * 8 + 2, 18)
+        (text.chars().count() as u32 * 8 + 2, 18)
     }
 }
 
@@ -60,4 +60,4 @@ lazy_static! {
             font
         })
     };
-}
\ No newline at end of file
+}