Restore Last Window Tabs on Startup

[kavehtehrani]

Adds an optional feature to restore the tabs and split-view state of the last closed Nemo window when launching without explicit file arguments. This is similar to the 'session restore' feature in most modern web browsers.

Changes

• New preference: "Restore last window tabs on startup" toggle in Preferences → Behaviour (default: off)
• Session state storage: Saves tab URIs, active tab indices, and split-view state when a window is closed
• Restore logic: On startup (when no file arguments provided), restores saved tabs if the preference is enabled
• Fallback behavior: Falls back to opening Home directory if restore fails or preference is disabled

Implementation Details

• Session state is saved to GSettings keys under org.nemo.window-state schema
• Only native file system locations are saved (excludes search tabs and remote locations)
• When multiple windows are open on quit, the state of the last non-desktop window is saved
• Default startup behavior is unchanged (feature is opt-in)

[kavehtehrani]

I read through 3240 and 2832 and seems like this was previously requested and closed due to resource constraints and being a low priority request.

I have tested this on my machine on Fedora and Ubuntu and has been working fine without any issues. I love Nemo and this is the only major things for me that Nemo is lacking. Happy to make any feedback and make my favorite file manager even better.

[kavehtehrani]

@mtwebster you are correct on both accounts. It is the most recent window that comes back (https://docs.gtk.org/gtk3/method.Application.get_windows.html)

I had to move the "#include "nemo-desktop-window.h"" outside the conditional include, since the NEMO_IS_DESKTOP_WINDOW is included in that header file and it was a conditional include. Hope I did this right.