message: Fix CellForeground and CellBackground cursor colors
  This commit fixes regression introduced in
  when setting
  certain CellForeground/CellBackground combinations stoppped working.
diff: @@ -398,13 +398,14 @@ impl<'a, C> Iterator for RenderableCellsIter<'a, C> {
  let mut cell = RenderableCell::new(self, cell);
  if self.cursor.key.style == CursorStyle::Block {
  - // Invert cursor if static background is close to the cell's background.
  - match self.cursor.cursor_color {
  - CellRgb::Rgb(col) if col.contrast(cell.bg) >= MIN_CURSOR_CONTRAST => {
  - cell.fg = self.cursor.text_color.color(cell.fg, cell.bg);
  + cell.fg = match self.cursor.cursor_color {
  + // Apply cursor color, or invert the cursor if it has a fixed background
  + // close to the cell's background.
  + CellRgb::Rgb(col) if col.contrast(cell.bg) < MIN_CURSOR_CONTRAST => {
  + cell.bg
  },
  - _ => cell.fg = cell.bg,
  - }
  + _ => self.cursor.text_color.color(cell.fg, cell.bg),
  + };
  }
  return Some(cell);
  @@ -422,11 +423,11 @@ impl<'a, C> Iterator for RenderableCellsIter<'a, C> {
  let mut cell = RenderableCell::new(self, cell);
  cell.inner = RenderableCellContent::Cursor(self.cursor.key);
  - // Only apply static color if it isn't close to the cell's current background.
  - if let CellRgb::Rgb(color) = self.cursor.cursor_color {
  - if color.contrast(cell.bg) >= MIN_CURSOR_CONTRAST {
  - cell.fg = self.cursor.cursor_color.color(cell.fg, cell.bg);
  - }
  + // Apply cursor color, or invert the cursor if it has a fixed background close
  + // to the cell's background.
  + match self.cursor.cursor_color {
  + CellRgb::Rgb(color) if color.contrast(cell.bg) < MIN_CURSOR_CONTRAST => (),
  + _ => cell.fg = self.cursor.cursor_color.color(cell.fg, cell.bg),
  }
  return Some(cell);
  