Describe the bug

Chinese can be entered in the first position of text_editor, but not in other positions

To Reproduce
Steps to reproduce the behavior:

1. git clone eframe_template

2. setup custom fonts:
   fn setup_custom_fonts(ctx: &egui::Context) {
   // Start with the default fonts (we will be adding to them rather than replacing them).
   let mut fonts = egui::FontDefinitions::default();

   // Install my own font (maybe supporting non-latin characters).
   // .ttf and .otf files supported.
   fonts.font_data.insert(
   "my_font".to_owned(),
   egui::FontData::from_static(include_bytes!(
   "msyh.ttc"
   )),
   );

   // Put my font first (highest priority) for proportional text:
   fonts
   .families
   .entry(egui::FontFamily::Proportional)
   .or_default()
   .insert(0, "my_font".to_owned());

   // Put my font as last fallback for monospace:
   fonts
   .families
   .entry(egui::FontFamily::Monospace)
   .or_default()
   .push("my_font".to_owned());

   // Tell egui to use these fonts:
   ctx.set_fonts(fonts);
   }

3. cargo run

Expected behavior

check this scrennshorts，“你好” can be entered in the first position， but can not entered after "test"

Screenshots

Desktop (please complete the following information):

• OS: I check windows 11 and unbuntu，has the same behavior.
• Browser
• Version