Tweak comments in TermThemeRenderer::clear() a bit.

Author: grunweg

src/theme.rs

@@ -843,11 +843,12 @@ impl<'a> TermThemeRenderer<'a> {
     ///
     /// Position the cursor at the beginning of the current line.
     pub fn clear(&mut self) -> io::Result<()> {
-        // We must clear the current line first: `clear_last_lines` places the cursor on the first deleted line,
-        // whereas we want to have it on the current line.
+        // clear_last_lines only clears the lines preding the current one.
         self.term.clear_line()?;
         self.term
             .clear_last_lines(self.height + self.prompt_height)?;
+        // Technically, self.term now contains self.height + self.prompt_height empty lines after
+        // the current line. As these are empty, we don't really care, though.
         self.height = 0;
         Ok(())
     }