Missing menu items on systems with no network interface

[smcgu]

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Describe the bug

Templates and other menu items are not available when the drawio app is run on a system with no network. A portion of this bug was previously reported: #678 (comment)

To Reproduce

Steps to reproduce the behavior:

0. Network isolate system
1. Download AppImage
2. Open draw.io app
3. Create New Diagram
4. Observe no template pop-up
5. Arrange > Insert
6. Observe no Template menu option
7. Open Help menu
8. Observe missing help menu items, it only contains "Keyboard shortcuts" and "v26.0.9"

Expected behavior

Templates, the help menu, and other menu items should be visible offline and online.

Screenshots

Unfortunately, I cannot add screenshots because something appears broken between Firefox and GitHub's CORS config.

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://github-production-user-asset-****.s3.amazonaws.com/. (Reason: CORS request did not succeed). Status code: (null).

Some screenshots are available on the other comment: #678 (comment)

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io version 26.0.9

Desktop (please complete the following information):

• OS: Linux AppImage

Additional context

None

[smcgu]

Correction. This behavior will exhibit at any time while the app is running if the network interfaces change. Access to the Internet is not required. This seems to be solely based on whether there is a network interface.

If there is only a loopback interface, then the menus are broken.

$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

If you add an interface (even without actual connectivity to the Internet), the menus work correctly (without needing to restart the app).

$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group 1 qlen 1000
    link/ether aa:bb:cc:dd:ee:ff brd ff:ff:ff:ff:ff:ff

[smcgu]

If you then remove the network interface, the menu items will return to their broken, abbreviated state.