Align-To-Grid algorithm is too conservative #621
Description
Align to Grid starts at the top-left selected panel and tries to create rows, looking for the next panel to the right to align and if none is found then it moves to the next row, starting below the first panel in the previous Row.
If no panel is found then it stops.
This means that panels before the first column (of the top-left panel) get missed, and so do any that come after a "gap".
E.g. Before "Align To Grid"...
and After...
In general, the existing algorithm (align each panel to it's neighbour in rows, rather than one overall grid) works well for handling panels of different sizes.
We just need to look a bit harder to find the first panel of each row:
- check the column to the left
- for each panel of the previous row, check below until we find the first panel of the next row