rust-mode: Default rust-indent-offset to 4, not default-tab-width #8830
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default-tab-width is standardly 8, but most programmers and style guides prefer an indentation width smaller than that. Rust itself uses 4 space indents. Most other Emacs modes define the indentation width as 4 or 2 spaces, independently of the width of a Tab character. Depending on default-tab-width makes especially little sense for rust-mode because it sets indent-tabs-mode to nil. Signed-off-by: Anders Kaseorg <andersk@mit.edu>
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`default-tab-width` is standardly 8, but most programmers and style guides prefer an indentation width smaller than that. Rust itself uses 4 space indents. Most other Emacs modes define the indentation width as 4 or 2 spaces, independently of the width of a Tab character. Depending on `default-tab-width` makes especially little sense for rust-mode because it sets `indent-tabs-mode` to `nil`.
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default-tab-widthis standardly 8, but most programmers and style guides prefer an indentation width smaller than that. Rust itself uses 4 space indents. Most other Emacs modes define the indentation width as 4 or 2 spaces, independently of the width of a Tab character. Depending ondefault-tab-widthmakes especially little sense for rust-mode because it setsindent-tabs-modetonil.