* lisp/progmodes/project.el (project-get-project, project-current):
Rationalize interfaces.
(project--files-in-directory): Whitespace.
(project-try-vc): Avoid swallowing errors.
(project-files): De-obfuscate.
(project--vc-list-files): Whitespace.
(project-find-regexp, project-or-external-find-regexp, project-find-file,
project-or-external-find-file, project-find-dir, project-dired,
project-vc-dir, project-eshell, project-shell, project-async-shell-command,
project-shell-command, project-search, project-query-replace-regexp,
project-compile, project--read-project-buffer, project-list-buffers,
project-kill-buffers, project-switch-project): DWIM.
(project--read-file-cpd-relative): De-obfuscate.
(project-find-file-in): Whitespace.
(project-most-recent-project): New DWIM function.
(project-remember-project, project-prompt-project-dir): De-obfuscate.
(project-execute-extended-command): Rationalize interfaces.
(project-remember-projects-under): Avoid backslashes.
* lisp/progmodes/xref.el (xref-matches-in-files): Do expand-file-name here.
* test/lisp/progmodes/project-tests.el (project-switch-project-extant-buffer,
project-implicit-project-absorption, project-assume-mru-project): Test.
(project-vc-extra-root-markers-supports-wildcards): Dude.