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