Grid Width

[Mark Erbaugh]

Is there a way to determine the width needed to display a grid without a
horizontal scrollbar even when a vertical scrollbar is displayed.

I added a grid to a vertical box sizer on a frame. The grid is the
widest thing on the frame.  As long as there is no vertical scrollbar,
the entire grid is displayed.  However, if I reduce the height of the
frame so that a vertical scrollbar is needed for the grid, the width of
the vertical scrollbar reduces the width of the grid and a horizontal
scrollbar is displayed.

Is there a way to determine the width of a vertical scrollbar or the
height of a horizontal scrollbar. I believe they are different sizes
depending on the operating system and perhaps display themes.

When the above grid is displayed (under GTK, at least), there are a few
pixels of background color to the left and bottom of the grid. If I
resize the frame to eliminate those, the scrollbars return.  Is there a
way to have the bottom and right edges of the grid exactly at the edge
of the grid, except for space for an undisplayed vertical scrollbar.