I'm not sure if the input max size and the output max size should be
separate, and I'm not sure whether the min size should also have an
effect on the input. For now, this works well enough, but I may need to
adjust it in the future as I stumble across new edge cases.
This change was made because I was using Resize as a way to set the size
of widgets containing text that were rendered inside Predraw widgets.
After this change, setting a max_width but no max_height has the desired
effect of making the inner widgets perform word wrapping. The resulting
Predrawn is then as high as it needs to be to contain the wrapped text.
Previously, Predrawn would use its parent frame's size. Now, it uses the
size requested by the widget. Because of this, it no longer requires a
full &mut Frame, but only a &mut WidthDb.
To set a maximum size, the widget can be wrapped inside a Resize.
All builder-like functions are now named with_*. There is also now a way
to set each property imperatively with only a mutable reference.
The only widgets I haven't yet converted to this style are the Join*
widgets; they're a bit harder to figure out an appropriate API for.
This will make the generated documentation more readable once I add
module docstrings. I'm still reexporting the module contents to keep
imports nice and tidy.
