Enhancement: Structure panel: provide default tree expansion setting, etc.

[jfehrle]

plugin version: 0.124-2023.1

Description

These would be helpful in the structure panel:

• actions to expand or contract all nodes in the current file (note that text searching in the tree doesn't find hidden subnodes)
• a settable default to control whether to expand the structure tree automatically when I open a file.
• make "show nested expressions" a per-file setting rather than a global setting, and then
• provide a settable default for "show nested expressions" to apply when I open a file
• provide a filter setting to select whether to show variables (preferably per-file with user-settable default when you open files) See screen shot below. Most of the items are variables, but I'm often much more interested seeing in the functions.

Would you like me to split this into multiple issues? [Done]

[giraud]

yes, it would be better to have separate issues.
a per file settings doesn’t seem doable though