- Handle non-uniform child heights properly - use a constant
grid size as the maximum of all child heights; with the
previous code, the children might not line up in the two
columns and the last item could be lost if the second column
was taller than the first column.
- Call set_skip_paint(child, false) on children that we do
want visible to override any previous hiding of that child.
- Correctly handle the DashDocDisplay not being allocated at 0, 0;
children should be allocated starting at 0, 0, not at origin
of the allocation box passed in.
- Remove an unused skipPaint variable.
https://bugzilla.gnome.org/show_bug.cgi?id=608801
9afb09128b