Change of behaviour for default styling

[alderg]

We will be changing the default behaviour of styling from the 21.0.0 release. The current behaviour is as follows:

• There are two stored styles, one for shapes and one for connectors.
• When you make changes to certain styles on a shape or connector, the default, stored, style for that type is updated. The font characteristics used in a shape become the default for the next shape, for example.
• There are also options to set the default style based on the current selection. Those are available in the format panel and right-click menu, depending on the interface used.

From 21.0.0 onwards you will need to explicitly set default style(s) using the interface. The current behaviour is non-standard and we prefer to avoid "hidden" behaviours like this one.

If you prefer the current behaviour, there is a configuration option to replace it:

{
  "updateDefaultStyle": true
}

You can set that behaviour by clicking this link (don't click the link if you don't want it) : https://app.diagrams.net/#_CONFIG_UzV3UjUyKi1ISSxJdUlNSyzNKQkuqcxJBQqqGjuWFJWmqpq7AAA=

That will add the entry to your JSON config.

[davidjgraph]

This change comes into effect in today's 21.0.1 release.