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This patch refactors the default_backend function to return a Box<dyn
Backend> instead of impl Backend. This will allow us to dynamically
choose the backend implementation in a future patch. To keep the
current interface, we change show_with to accept both a reference to a
backend instance as well as a reference to a boxed backend instance.
This also means we have to implement AsRef<Self> for the backend
structs.
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This patch implements input dialog boxes. This required some
refactoring in the dialog backend to allow additional arguments after
the width and the height.
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dialog(1) uses stdin to display the dialog boxes and prints output to
stderr (if applicable). This patch changes the command invocation in
the Dialog backend to capture stderr. stdin and stdout are inherited
from the main process so that dialog can display the dialog boxes and
receive user input.
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This patch adds a first dialog box type, message boxes, and a first
backend, the dialog(1) tool. It does not yet address the problems of
output handling and backend selection.
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