Switching from columns view to another view loses column metadata #3543
Description
Describe the bug
- Create a notebook with a two columns, and arrange cells across the columns
- Switch to a compact view and save.
Expected behavior:
- Column metadata is still persisted in the notebook file.
Actual behavior:
- Column metadata is erased from the file.
Environment
{
"marimo": "0.10.16",
"OS": "Darwin",
"OS Version": "22.5.0",
"Processor": "arm",
"Python Version": "3.12.4",
"Binaries": {
"Browser": "131.0.6778.265",
"Node": "v21.5.0"
},
"Dependencies": {
"click": "8.1.8",
"docutils": "0.21.2",
"itsdangerous": "2.2.0",
"jedi": "0.19.2",
"markdown": "3.7",
"narwhals": "1.23.0",
"packaging": "24.2",
"psutil": "6.1.1",
"pygments": "2.19.1",
"pymdown-extensions": "10.14.1",
"pyyaml": "6.0.2",
"ruff": "0.9.2",
"starlette": "0.45.2",
"tomlkit": "0.13.2",
"typing-extensions": "4.12.2",
"uvicorn": "0.34.0",
"websockets": "14.2"
},
"Optional Dependencies": {}
}
Code to reproduce
import marimo
__generated_with = "0.10.16"
app = marimo.App(width="columns")
@app.cell(column=0)
def _():
"1"
return
@app.cell(column=1)
def _():
"2"
return
if __name__ == "__main__":
app.run()