Created attachment 166185 [details] [review]
Convert INNER_BORDER, CALENDAR_XSEP, CALENDAR_YSEP to style properties.

GtkCalendar has some constants defined that affect the size/layout of it, and it seems like it would be nice to move those to be style properties.

In particular the one I care about is INNER_BORDER (I feel like it's too big and clunky looking now, and changing to 0 makes it feel tighter to me), but while I'm at it I figure we might as well convert the others to style properties as well.

I'm attaching a patch that turns INNER_BORDER, CALENDAR_XSEP, and CALENDAR_YSEP into style properties.  There are three constants that I didn't convert yet, as I'd like some feedback: CALENDAR_MARGIN, DAY_XSEP, DAY_YSEP.  All three are #defined as 0, and DAY_XSEP/DAY_YSEP both have a comment saying how they're not really useful for a small calendar.

So I wonder if these should be converted to style properties as well, or if they should be left alone, or if they're really useless then maybe they should just be removed to clean up the code a bit.  I'm willing to do any of these options while I'm looking at this.