Scroll to the selection when setting it so the selected font is
visible on screen. This is especially useful if an initial font is
set for the user to see it.
https://bugzilla.gnome.org/show_bug.cgi?id=684156
This way, all rows have the same height. It has 3 advantages:
1) No actual computation is necessary to compute the size of the cell.
This speeds up the list tremendously (filling out the list goes from
25s to 3s).
2) Buggy fonts don't mess up the list anymore with their weird sizes.
Instead, they are clipped / empty space is added.
3) Buggy fonts look more buggy. So their use is hopefully discouraged.
With absolute sizes, Pango is way better at getting the actual sizes of
the fonts to match up. It's a bit harder to compute a proper value for
this, whcih makes the code ugly, but as long as it works better...
This way, we can find fonts way quicker as we only need to create font
descriptions for fonts with matching families. Most importantly, we're
rather quick in the "the font doesn't exist" case.
Name it gtk_font_chooser_widget_load_fonts(). Also, don't take any
arguments, they were the same everywhere and they're member variables of
the font chooser anyway.
Instead of reloading the font list, we now just queue a redraw. This
works, because the preview text is added using a cell data func instead
of a custom column.
... which looks up the font in the list of fonts. This then can be used
to select an actual font upon changes.
Also fixes cases where the get_family() and get_face() functions would
return outdated data when set_font() had been called.
They now go through gtk_font_chooser_widget_take_font_desc(). The end
goal is to make all changes go through this function, so that all
updates that are happening are easy to track.
Another change is that the code now merges the font description instead
of just using the new one. This avoids weird situations when people set
the font "Bold" for example, which has neither a size nor a font family.
... instead of rereading all the fonts every time.
With this change, the liststore now contains every font face known to
GTK, so we can actually walk it for matching fonts.
- Don't do unnecessary casts
- Fix weird variable declaration indenting
- Fix loop indentation
- Use a for loop for iterating over a list, instead of a while loop
- Casefold font name only once, instead of every iteration
- Remove needless true_var = true_var && TRUE assignment
