Fix UDHR test and libcosmic compilation

examples/editor-libcosmic/src/text_box.rs

@@ -136,8 +136,6 @@ where
         let appearance = theme.appearance();
         let text_color_u32 = appearance.text_color_u32();
 
-        let buffer = self.buffer.lock().unwrap();
-
         let instant = Instant::now();
 
         if let Some(background_color) = appearance.background_color {
@@ -152,6 +150,8 @@ where
             );
         }
 
+        let mut buffer = self.buffer.lock().unwrap();
+
         buffer.shape_until_cursor();
 
         let buffer_x = layout.bounds().x;

examples/editor-test/src/main.rs

@@ -122,7 +122,7 @@ fn main() {
         log::debug!("Line {:?}", line);
 
         for c in line.chars() {
-            if c.is_control() {
+            if c.is_control() && c != '\t' {
                 log::warn!("Ignoring control character {:?}", c);
                 continue;
             }