Cell widths does not get revalidated when hiding cells

If you hide a cell the visible cells with \* width should get new width to fill the space the hidden cell took

No file or test is named. Start by locating the cell-hiding path and the logic that assigns widths to visible cells marked with '*', then reproduce the layout before and after hiding a cell. Done means those cells are revalidated and expand to fill the space released by the hidden cell, with a regression test if the repository has an existing grid test location.

Written by the indexing model from the issue text.