Ability to dynamically reduce center layout padding when there is less space

[tealsnow]

Check for existing issues

• Completed

Describe the feature

I use the centered layout most of the time, but when I open something like the assistant panel, it ends up squishing the editor view too small (as seen in the attached screenshot). I can change the left and right padding statically using the centered_layout settings. But this makes the padding too small without the panel. I find my self toggling the center layout far too often than I would like.

I propose that there should be a configuration for minimum and maximum padding in centered_layout, let's say I set the minimum to 0 and the max to the default of 0.2. In the event that there is not enough space to display enough of the editor, it will resize within the range configured. The target size (columns) could perhaps be determined by the wrap_guides setting or a new one in centered_layout. Thus, in the event that I open the assistant panel that the editor will expand to a comfortable size, then when I close it, the padding will increase again.

For example:

"centered_layout": {
  "min_left_padding": 0,
  "max_left_padding": 0.2,
  "min_right_padding": 0,
  "max_right_padding": 0.2,
  "target_column_width": 80
}

If applicable, add mockups / screenshots to help present your vision of the feature