Windows - dvc plots show incorrect directory structure for manual plot images.

[dfossl]

Bug Report

dvc plots show: img src directory incorrectly formatted for saved plot images (Windows)

Description

On windows, when using a saved .png of a matplotlip plot for visualization with 'dvc plots show' the default img src is "dvc_plots\static\workspace_.png"
When it should be "static\workspace_.png"

Reproduce

mkdir example
cd example
git init
dvc init

With this script as evaluate.py

import os

from dvclive import Live
from matplotlib import pyplot as plt

live = Live("evaluation")

y_true = [0, 0, 1, 1]
y_pred = [0.2, 0.5, 0.3, 0.8]
live.log_plot("roc", y_true, y_pred)

fig, axes = plt.subplots(dpi=100)
fig.subplots_adjust(bottom=0.2, top=0.95)
plt.scatter([1,2,3], [4,5,6])
fig.savefig(os.path.join("evaluation", "importance.png"))

Running this command (Powershell 7):

dvc run -n evaluate `
-d .\evaluate.py `
--plots-no-cache .\evaluation\plots\roc.json `
--plots evaluation\importance.png `
python .\evaluate.py

Followed by:

dvc plots show

Results in directory:

dvc_plots
    |-index.html
    |-static\
        |-workspace_evaluation_importance.png

Where the img src is:

 <img src="dvc_plots\static\workspace_evaluation_importance.png">

html page:

Expected

Should be:

 <img src="static\workspace_evaluation_importance.png">

html page:

Environment information

Output of dvc doctor:

$ dvc doctor
DVC version: 2.10.2 (pip)
---------------------------------
Platform: Python 3.10.4 on Windows-10-10.0.17763-SP0
Supports:
        webhdfs (fsspec = 2022.5.0),
        http (aiohttp = 3.8.1, aiohttp-retry = 2.4.6),
        https (aiohttp = 3.8.1, aiohttp-retry = 2.4.6)
Cache types: hardlink
Cache directory: NTFS on C:\
Caches: local
Remotes: None
Workspace directory: NTFS on C:\
Repo: dvc, git

[pared]

Good catch! It should be partially fixed by:
#7664

We need to wait for a next release for that.

Proper fix will come after we merge and release iterative/dvc-render#39

[pared]

Leaving it open till we finish all the needed changes.