UX adjustments for line numbers in the notebooks editor

[ronglums]

Turn on line numbers for cells in the notebook editor. see if we can make adjustments so it's consistent with the regular VS Code editor.

1. Line numbers font color to be the same as a regular editor
2. The vertical line b/w line numbers and code to be editor background color
3. increase space b/w line numbers and code

[rchiodo]

1. is already true? Not sure what you mean

[tbrodbeck]

How can I turn on line numbers in a vscode notebook?

[rchiodo]

@tbrodbeck, hit the 'L' key when a cell is selected.

[ronglums]

@rchiodo for microsoft/vscode-python#1, the line number colors are not the same as in a regular editor. see the screenshots below.

[rchiodo]

Oh, they might have custom colors in the theme for that. Uggh.

[DonJayamanne]

Here's what it looks like now (the image on top is the native editor, and the one at the bottom in VSC editor with the same text).
Using same styles from VSC themes.

[IanMatthewHuff]

Validated with a half dozen or so themes.