Support double-whitespaces in dvc.yaml-commands

[maxgriehl-web]

Hi,

I encountered a problem with command-formatting in dvc.lock-files: Some double spaces of the dvc.yaml-command are not stored in the dvc.lock-clone.
This happens if the command is too long, and gets formatted with an additional line break exactly at the double-space.

Is that a known issue? I couldn't find anything.

Here's a minimal example:

# 1. Create a new directory and initialize DVC
mkdir my-dir && cd my-dir
git init
dvc init

# 2. Create a dvc.yaml with lots of double spaces in the command
cat > dvc.yaml << 'EOF'
stages:
  test_stage:
    cmd: echo "lots"  "of"  "words"  "(too much"  "for"  "one"  "line)"  "with"  "lots"  "of"  "double-whitespace"  "between"  "the"  "parts" > output.txt
    outs:
      - output.txt
EOF

# 3. Run the stage to generate initial lock file
# (you can check in it that some double-space became a line-break!)
dvc repro

# 4. Check status - should be clean but shows "changed command"
dvc status

[maxgriehl-web]

I got convinced that this should actually be a bug-report: So I opened one here.