Add a non-visible root item.
Dashboard is the first child of the root item (it was the root before).

This causes a crash whenever the nav tree is reset (#6998). I've put fixes under PR #6999.

Adjust spacing of open/close symbols (a little more compact layout, the symbols still show clearly the hierarchy).

I think this is making it impossible to collapse first-level nodes on Windows.

This was also caused by wxTR_HIDE_ROOT. Needed to explicitly enable lines at root level. Also now fixed under #6999.

Thank you @n-stein

On macOS I don't see any of these issues. I compiled wxWidgets-3.2.6 with --enable-debug and MMEX with -DCMAKE_BUILD_TYPE=Debug. I don't get any alert at startup, the top-level items can expand and collapse, and I could delete a transaction without crash.

@whalley Do you see the issues above?

This is how it looks on macOS:

I tested #6999 on macOS, it looks good (I don't see any difference).

Should the screenshots be updated before next release?

Should the screenshots be updated after:

1. the Dashboard image is updated?
2. Add executions of scheduled transactions in transaction panels #6860 has be implemented?

Can you please advise where the MMEX data file is which is used for creating the screenshots?

Thank you

Right-clicking on "Dashboard" brings up the "Theme Manager". Is that the desired behavior? Thank you

Right-click on "Dashboard" did not change with this PR. I don't know the history of this behavior, but if there are no other settings for "Dashboard", it is ok to bring something else which is useful.

It could open [Options -> Dashboard] instead, which is more relevant.