strange results from usize, set_policy, and default_size

[Kees Cook <gtk-app outflux net>]

Hello!

(I posted this on the 14th, but wasn't a list member.  Sorry if the 
original gets approved at some point, duplicating this one.  Also, I 
solved this problem by the time I got to the end of writing the 
email, but I'm still curious about the described behavior...)

I have hit a wall trying to solve a bug in my application.  Here's what I 
have the application doing:

- remember the sizes of the multiple user-sizable windows
- remember a user-selectable font (via the glade font-dialog)

All the preference saving etc is done and working.  Same for window sizes.  
Sizes are restored on startup with "gtk_window_set_default_size" calls.

The only really big "trick" I had to use was doing widget resizing after a
font change.  Since the application is based on a older console tool, I
retained the concept of "80 columns".  So, after a font is selected, I
call gtk_widget_set_usize(GTK_WIDGET(whatever),wide,-2) after calculating
80*font_width for the value of "wide".  (I force only fixed-width fonts.)

While I force the minimum size to 80 columns, I want the user to be able 
to expand the window size.  Therefore, all the windows have:

gtk_window_set_policy(GTK_WINDOW(whatever),FALSE,TRUE,TRUE);

This lets users resize fine, but if they switch to a smaller font, the 
window does not auto_shrink, even if I call "gtk_widget_queue_resize".

Basically, I want font changes to snap the windows to whatever the 
80-column size is, regardless of the user's requested window size.  BUT, I 
want them to be able to grow the window size beyond that, and have it be 
remembered as long as they don't change the font.

While I know the set_policy call isn't "recommended" with "FALSE, TRUE, 
TRUE", the user can't grow the windows if I use "FALSE, FALSE, TRUE" 
(which, btw, DOES auto_shrink my windows on a font size change).

I've looked through the mailing lists, the APIs, tutorials.  I can't find 
anything that'll handle this.  The only thing that I've been able to do 
that almost works is calling "gtk_window_set_default_size", but this isn't 
proper since I don't know the actual size of the window (I'm setting 
widget widths inside containers in the window).

Oh, I was just struck with an idea.  While "gtk_widget_queue_resize" 
didn't work, calling "gtk_window_set_default_size(window, 0, -2)" seemed 
to force it to recalculate the width and set it to the least possible 
width!  Yay!  Well, I guess this mailing list did help me.  ;)

So, nevermind, I have a solution.  I guess I'll ask a question anyway: why 
doesn't auto_shrink work in this situation?  Or is this the reason that 
"FALSE, TRUE, TRUE" isn't recommended?

-- 
Kees Cook                                            @outflux.net