replace some control characters with their symbol counterparts

src/ui/bigtext/bigtext.py

@@ -421,15 +421,7 @@ class InnerBigText(QWidget):
         left_offset = int(-1 * self._left_offset * self.char_width)
         y_line_offset = self.char_height;
         for l in self.lines:
-            text = l.line_tabs_replaced()
-            text = text.replace("\0", "␀") # qt throws error if we try to draw a null character
-            text = text.replace("\1", "␁")
-            text = text.replace("\2", "␂")
-            text = text.replace("\3", "␃")
-            text = text.replace("\4", "␄")
-            text = text.replace("\5", "␅")
-            text = text.replace("\6", "␆")
-            text = text.replace("\a", "␇")
+            text = l.line_prepared_for_display()
             painter.drawText(left_offset, y_line_offset, text)
             y_line_offset = y_line_offset + self.char_height