rstudio-prefs.json: Tweak the default behavior (to avoid some of the startup issues)

[HenrikBengtsson]

Given how some users end up in a situation where they struggle to launch RStudio again, and inspired by [1], we should set the defaults to launch RStudio in a clean slate, e.g.

{
  "restore_source_documents": false,
  "save_workspace": "never",
  "load_workspace": false,
  "restore_last_project": false
}

See [2] for available settings.

This should be done such that the user can still override these settings. The system-wide settings should be located in folder RSTUDIO_CONFIG_DIR -> XDG_CONFIG_DIRS [3]. The user-specific settings are located in RSTUDIO_CONFIG_HOME -> XDG_CONFIG_HOME [3].

References

1. Do not load previous session by default rstudio/rstudio#12028 (comment)
2. Available settings: https://docs.posit.co/ide/desktop-pro/settings/preferences.html
3. File locations of settings: https://docs.posit.co/ide/desktop-pro/settings/settings.html

[HenrikBengtsson]

rsc config reports on this file;

$ bin/rsc config
...
RStudio User Configuration:
XDG_CONFIG_HOME: <not set>
RSTUDIO_CONFIG_HOME: <not set>
RStudio config home: /home/henrik/.config/rstudio [53824697 bytes; 2024-09-20 22:11:06]
RStudio user preferences: /home/henrik/.config/rstudio/rstudio-prefs.json [38 bytes; 2024-11-10 15:46:12]
...

and

$ rsc config --full
...
RStudio User Configuration:
XDG_CONFIG_HOME: <not set>
RSTUDIO_CONFIG_HOME: <not set>
RStudio config home: /home/henrik/.config/rstudio [53824697 bytes; 2024-09-20 22:11:06]
RStudio user preferences: /home/henrik/.config/rstudio/rstudio-prefs.json [38 bytes; 2024-11-10 15:46:12]
{
    "jobs_tab_visibility": "shown"
}
...