Fixed issue where graphemes weren't respected by the text box editing.

src/widgets/text_box.rs

@@ -218,13 +218,14 @@ pub fn text_box_render(
                                 let cursor_pos = state.cursor_position;
                                 if is_backspace(c) {
                                     if !state.current_value.is_empty() {
-                                        // TODO: This doesn't respect graphemes!
-                                        state.current_value.remove(cursor_pos - 1);
+                                        let char_pos: usize = state.graphemes[0..cursor_pos - 1].iter().map(|g| g.len()).sum();
+                                        state.current_value.remove(char_pos);
                                         state.cursor_position -= 1;
                                     }
                                 } else if !c.is_control() {
-                                    // TODO: This doesn't respect graphemes!
-                                    state.current_value.insert(cursor_pos, c);
+                                    let char_pos: usize = state.graphemes[0..cursor_pos].iter().map(|g| g.len()).sum();
+                                    state.current_value.insert(char_pos, c);
+
                                     state.cursor_position += 1;
                                 }
 
@@ -387,6 +388,25 @@ fn set_graphemes(
     }
 }
 
+fn get_single_grapheme_length(
+    font_assets: &Res<Assets<KayakFont>>,
+    font_mapping: &FontMapping,
+    style_font: &StyleProp<String>,
+    text: &String,
+) -> usize {
+    let font_handle = match style_font {
+        StyleProp::Value(font) => font_mapping.get_handle(font.clone()).unwrap(),
+        _ => font_mapping.get_handle(DEFAULT_FONT.into()).unwrap(),
+    };
+
+    if let Some(font) = font_assets.get(&font_handle) {
+        let graphemes = font.get_graphemes(&text);
+        return graphemes[0].len();
+    }
+
+    0
+}
+
 fn set_new_cursor_position(
     state: &mut TextBoxState,
     font_assets: &Res<Assets<KayakFont>>,