message: Fix mouse move handling
  This commit fixes the regression introduced in
  Fixes
diff: @@ -414,7 +414,7 @@ impl<'a, A: ActionContext + 'a> Processor<'a, A> {
  prev_line != self.ctx.mouse().line || prev_col != self.ctx.mouse().column;
  // If the mouse hasn't changed cells, do nothing
  - if cell_changed || prev_side != cell_side {
  + if !cell_changed && prev_side == cell_side {
  return;
  }
  