Tweak C-x TAB behavior changes, and update docs.
* lisp/indent.el (indent-rigidly-map): Add docstring, and move commands into named functions. (indent-rigidly-left, indent-rigidly-right) (indent-rigidly-left-to-tab-stop) (indent-rigidly-right-to-tab-stop): New functions. Decide on indentation direction based on bidi direction, and accumulate sequential commands in a single undo boundary. (indent-rigidly--pop-undo): New utility function. * doc/emacs/indent.texi (Indentation Commands): Document C-x TAB changes. * doc/lispref/text.texi (Region Indent): Note the new interactive behavior of indent-rigidly.
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