Update Microsoft.WSLg to 1.0.77

[benhillis]

Picks up the fix for GUI app icons disappearing from the Start menu after updating to 2.7.3 (Azure Linux 3 system distro).

Root cause: The system distro upgrade in WSLg 1.0.72 brought in librsvg 2.58, which lazily spawns a rayon thread pool the first time it has to render a complex SVG icon. Those worker threads share fs_struct with weston's app-list enumeration thread and break the subsequent setns(CLONE_NEWNS) into the user distro's mount namespace, causing every app processed after the first complex-icon one to drop off the Start menu. Adwaita-style flat icons stay on librsvg's single-threaded path; richer icons (Audacity, GIMP, JetBrains, Discord) trigger it.

Fix: microsoft/weston-mirror#162 — call unshare(CLONE_FS) inside attach_app_list_namespace before every setns, so the call is robust against any thread-spawning library on this code path. Rolled into Microsoft.WSLg 1.0.77.

Validation: Built a local system distro from the patched weston-mirror branch, swapped it into a fresh user distro, installed all the trigger apps from the original repro (audacity / gimp / inkscape / vlc on top of the GNOME flat-icon set). All 18 apps published cleanly:

=== failures (expect 0) ===
0
=== notify_app_list count ===
18
=== unshare errors (expect 0) ===
0

And on the host:

PS> dir `C:\Users\benhill\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Ubuntu\*.lnk` | Measure-Object | % Count
18

Fixes microsoft/wslg#1444
Fixes #40538

[Copilot]

Pull request overview

Bumps the Microsoft.WSLg NuGet dependency from 1.0.76 to 1.0.77 to pick up the weston-mirror fix that prevents GUI app icons from disappearing from the Start menu after updating to WSL 2.7.3.

Changes:

• Update Microsoft.WSLg package version from 1.0.76 to 1.0.77 in packages.config.