Transparency symbol

[Koji Yokota]

> 2026/07/05 21:47、Jürgen Spitzmüller <jspitzm at gmail.com>のメール:
> 
> Dear Koji
> 
> I had a hard time to understand what the symbol used for transparent
> color means.
> 
> I suggest to use the established symbol for that, greyish chessboard-
> like pattern. I think this will be more familiar to users (and it's
> also what is displayed in the system color widgets used by LyX).
> 
> Agreed?

Yes. I simply adopted the current version since the triangle background design is used on mac’s color chooser and it’s easy to construct :) I know the check pattern is more popular.

Please give me some time to make it.

Koji