… widths

Remember the tree columns' widths across sessions, and after filtering, grouping, or reordering.

this fixes scss file not found error after installing the module

…on column

Fix an error when retrieving column sizes for lists containing one or more list_button columns.
This error occurs when a list_button column is placed between other columns in the list. This type of column is excluded from the querySelector string used to retrieve column headers, which can cause the index to shift and the column size to change when the list is displayed.