Powertoys: FanzyZones no longer working for remote desktop sessions in v0.16

[GeertvanHorrik]

Environment

Windows build number: 10.0.18363.752
PowerToys version: 0.16.0
PowerToy module for which you are reporting the bug (if applicable): FanzyZones

Steps to reproduce

Use Remote Desktop session, FanzyZones is no longer working.

Expected behavior

FanzyZones to work for remote desktop sessions.

Actual behavior

FanzyZones not working for remote desktop sessions.

Screenshots

[not applicable]

[GeertvanHorrik]

This issue is related to #1807. Was asked to create a separate ticket.

Here is some info:

I can confirm this as well on my ultra-wide monitor. Happens to my remote desktop sessions. It probably can't find the monitor device anymore. It works fine on the same monitor on the non-RD sessions.

Here is my remote desktop (virtualized) machine zone-settings.json:

{"app-zone-history":[],"devices":[],"custom-zone-sets":[]}
````

Here is the same monitor, but attached to real hardware:

"devices": [
    {
        "device-id": "SAM0F99#5&29836fa9&0&UID261_1680_1050_{00000000-0000-0000-0000-000000000000}",
        "active-zoneset": {
            "uuid": "{17837D3A-33B0-4CE0-B8D2-C2CEE228A872}",
            "type": "columns"
        },
        "editor-show-spacing": true,
        "editor-spacing": 16,
        "editor-zone-count": 3
    },
    {
        "device-id": "SAM0F99#5&29836fa9&0&UID261_1920_1080_{00000000-0000-0000-0000-000000000000}",
        "active-zoneset": {
            "uuid": "{17837D3A-33B0-4CE0-B8D2-C2CEE228A872}",
            "type": "columns"
        },
        "editor-show-spacing": true,
        "editor-spacing": 16,
        "editor-zone-count": 3
    },
    {
        "device-id": "SAM0F9C#7&43b830e&0&UID256_5120_1440_{00000000-0000-0000-0000-000000000000}",
        "active-zoneset": {
            "uuid": "{36CC55BE-1BA6-48B1-90AA-8B6E04D2E73E}",
            "type": "priority-grid"
        },
        "editor-show-spacing": false,
        "editor-spacing": 16,
        "editor-zone-count": 3
    }
],
"custom-zone-sets": []

```

I opened the zones-settings.json in notepad++. Then I open PT and select a new zone. It says the file has changed (so it has rewritten the contents), but the contents remain the same.

Whenever I re-open PT settings for FZ, the settings show the default (which is expected since the file is empty).

I also tried removing the file, and it creates a new one which is empty again.

I am currently debugging PT to see if I can easily fix this.

[GeertvanHorrik]

The temp file created still contains the right monitor info:

{"device-id":"Default_Monitor#1\u00261f0c3c2f\u00260\u0026UID256_5120_1440_{00000000-0000-0000-0000-000000000000}","active-zoneset":{"uuid":"{F5864905-41F2-4A90-8C3F-E2AB556952F1}","type":"priority-grid"},"editor-show-spacing":true,"editor-spacing":16,"editor-zone-count":3}

Results in these parameters being generated:

65537 0_0_5120_1400 5120_1440 "C:\Users\geert\AppData\Local\Temp\xfw4.1" "C:\Users\geert\AppData\Local\Temp\xfw4.2" "C:\Users\geert\AppData\Local\Temp\xfw4.0"

[GeertvanHorrik]

Found something interesting.

Input to editor app:

{"device-id":"Default_Monitor#1&1f0c3c2f&0&UID256_5120_1440_{00000000-0000-0000-0000-000000000000}","active-zoneset":{"uuid":"null","type":"blank"},"editor-show-spacing":false,"editor-spacing":0,"editor-zone-count":0}

Output from editor app:

{"device-id":"Default_Monitor#1\u00261f0c3c2f\u00260\u0026UID256_5120_1440_{00000000-0000-0000-0000-000000000000}","active-zoneset":{"uuid":"{BDD36AF5-7509-4EA8-930B-16816D8D66CE}","type":"priority-grid"},"editor-show-spacing":true,"editor-spacing":16,"editor-zone-count":3}

Notice how the device id has changed formatting. This causes this method not to recognize the device:

[GeertvanHorrik]

I am fairly certain this is caused by the json serialization:

[GeertvanHorrik]

Caused by this commit:

https://github.com/microsoft/PowerToys/commit/8156279025c0e9426643e3d533c56cfc84ea16b4

[enricogior]

@GeertvanHorrik
thanks for debugging it!

[GeertvanHorrik]

The first fix in is in LayoutModel::Apply of the editor app:

            // Note: The 'UnsafeRelaxedJsonEscaping` makes sure that monitor id's that contain '&' are not encoded
            JsonSerializerOptions options = new JsonSerializerOptions
            {
                PropertyNamingPolicy = new DashCaseNamingPolicy(),
                Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
            };

Another bug (related to this) is in JSONHelper::isValidDeviceId. The input value:

Default_Monitor#1&1f0c3c2f&0&UID256_5120_1440_{00000000-0000-0000-0000-000000000000}

This method splits by _ and force checks whether it has 4 elements. But... because the name is Default_Monitor, it will break because it results in a set of 5.

The solution here is to split the first element until the #.

[enricogior]

Yes isValidDeviceId needs to be fixed

[GeertvanHorrik]

I am fixing both in a PR if you are open to it.

[enricogior]

I think we only need to fix isValidDeviceId but let me verify it.

[enricogior]

The fact that the device id is encoded shouldn't be a problem since it gets correctly decoded when parsed in the C++ code, so let's fix only isValidDeviceId, and then we can verify for sure if it's enough. Thanks!

[GeertvanHorrik]

Ok. I will push a fix for isValidDeviceId only.

[GeertvanHorrik]

Note that I only tested the fix combined with the encoding fix in the editor. Then it correctly works on my RDP session.

[enricogior]

Just to make sure: did you also test it without the encoding fix and it didn't work?

[GeertvanHorrik]

Just to make sure: did you also test it without the encoding fix and it didn't work?

No, I didn't test with encoding disabled.

[enricogior]

Reopening until we release 0.16.1

[enricogior]

Fix available in 0.16.1 https://github.com/microsoft/PowerToys/releases
Thanks.