SSH remote editing + Markdown preview + PlantUML: plantuml code section won' t show up

[MeatBoy106]

Type: Bug

Preliminary note: I'm note using Markdown Preview Enhanced (which has its own issues with plantuml). I'm using the native Markdown previewer.

The issue arises while previewing a Markdown file that contains a plantuml code block in an SSH remote editing session with the PlantUML extension installed. I have configured PlantUML to use a local rendering server.

Minimum markdown file that triggers the issue:

```plantuml
@startuml
Bob -> Alice: Hello
@enduml
```plantuml

Expected result: the plantuml block is rendered by the plantuml server to be displayed in the markdown preview. Observed result: a tiny default placeholder icon () is displayed in place of the diagram.

Related observations:

• Preview works fine in local editing sessions (no SSH) using the same PlantUML rendering server as with the SSH remote edition session.
• Markdown preview security settings are not at play. If I set it to strict, I get the expected error message saying some non trusted content was blocked. If I set it to any other value, I don't get any error but I get that icon in place of the diagram when using SSH remote editing.

Extension version: 0.84.0 VS Code version: Code 1.71.2 (74b1f979648cc44d385a2286793c226e611f59e7, 2022-09-14T21:03:37.738Z) OS version: Windows_NT x64 10.0.19044 Modes: Sandboxed: No Remote OS version: Linux x64 5.15.0-46-generic Remote OS version: Linux x64 5.15.0-46-generic

System Info

|Item|Value| |---|---| |CPUs|Intel(R) Core(TM) i7-9850H CPU @ 2.60GHz (12 x 2592)| |GPU Status|2d_canvas: enabled
canvas_oop_rasterization: disabled_off
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_renderer: enabled_on
video_decode: enabled
video_encode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: disabled_off| |Load (avg)|undefined| |Memory (System)|31.73GB (14.87GB free)| |Process Argv|--crash-reporter-id f254e8dd-15b4-4f7e-904b-54d84726c6e9| |Screen Reader|no| |VM|0%| |Item|Value| |---|---| |Remote|SSH: ar001vm| |OS|Linux x64 5.15.0-46-generic| |CPUs|Intel(R) Xeon(R) Silver 4314 CPU @ 2.40GHz (6 x 2394)| |Memory (System)|31.35GB (20.90GB free)| |VM|40%| |Item|Value| |---|---| |Remote|SSH: ar001vm| |OS|Linux x64 5.15.0-46-generic| |CPUs|Intel(R) Xeon(R) Silver 4314 CPU @ 2.40GHz (6 x 2394)| |Memory (System)|31.35GB (20.90GB free)| |VM|40%|

[corex]

Same problem here. Extension works locally as supposed to, both with local renderer and render server (docker).

But as soon as the extension is used remotely (ssh), it does not work with server specified (docker). I have checked that I can reach the server remotely from the ssh server and i can.

Really looking forward to have this resolved. It is such a nice tool.

[arwedus]

Same problem for me. I'm in a project with hundreds of developers, most of them develop only via remote-SSH or remote containers session.

I assume that support of local plantuml renderer in the embedded Markdown preview would solve this issue (see https://github.com/qjebbs/vscode-plantuml/issues/255 )