Take "visible=0" flags into consideration in cli export

[ernstvonoelsen]

I'm using links in my diagrams of the form

data:action/json,{"actions":[{"tags":{"hidden":["to_be_hidden"],"visible":["to_be_shown"]}}]}

to set visibility on certain elements based on tags. This works fine in the frontend (desktop app) and the visibility is also considered correctly when I use the PNG or SVG export function.

However, when I batch-export a bunch of files via

drawio --export --format png <filename>

the resulting images always have all elements in it, i.e. the visible="0" flag is ignored (ChatGPT confirmed this explicitly).

Hence, I suggest to add a functionality to render only those elements which have eithe visible="1" or no visible flag at all, something like

drawio --export --format png --visible-only <filename>