merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

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+git-web{litdd}browse(1)
+=======================
+
+NAME
+----
+git-web--browse - Git helper script to launch a web browser
+
+SYNOPSIS
+--------
+[verse]
+'git web{litdd}browse' [<options>] <url|file>...
+
+DESCRIPTION
+-----------
+
+This script tries, as much as possible, to display the URLs and FILEs
+that are passed as arguments, as HTML pages in new tabs on an already
+opened web browser.
+
+The following browsers (or commands) are currently supported:
+
+* firefox (this is the default under X Window when not using KDE)
+* iceweasel
+* seamonkey
+* iceape
+* chromium (also supported as chromium-browser)
+* google-chrome (also supported as chrome)
+* konqueror (this is the default under KDE, see 'Note about konqueror' below)
+* opera
+* w3m (this is the default outside graphical environments)
+* elinks
+* links
+* lynx
+* dillo
+* open (this is the default under Mac OS X GUI)
+* start (this is the default under MinGW)
+* cygstart (this is the default under Cygwin)
+* xdg-open
+
+Custom commands may also be specified.
+
+OPTIONS
+-------
+-b <browser>::
+--browser=<browser>::
+	Use the specified browser. It must be in the list of supported
+	browsers.
+
+-t <browser>::
+--tool=<browser>::
+	Same as above.
+
+-c <conf.var>::
+--config=<conf.var>::
+	CONF.VAR is looked up in the Git config files. If it's set,
+	then its value specifies the browser that should be used.
+
+CONFIGURATION VARIABLES
+-----------------------
+
+CONF.VAR (from -c option) and web.browser
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The web browser can be specified using a configuration variable passed
+with the -c (or --config) command-line option, or the `web.browser`
+configuration variable if the former is not used.
+
+browser.<tool>.path
+~~~~~~~~~~~~~~~~~~~
+
+You can explicitly provide a full path to your preferred browser by
+setting the configuration variable `browser.<tool>.path`. For example,
+you can configure the absolute path to firefox by setting
+'browser.firefox.path'. Otherwise, 'git web{litdd}browse' assumes the tool
+is available in PATH.
+
+browser.<tool>.cmd
+~~~~~~~~~~~~~~~~~~
+
+When the browser, specified by options or configuration variables, is
+not among the supported ones, then the corresponding
+`browser.<tool>.cmd` configuration variable will be looked up. If this
+variable exists then 'git web{litdd}browse' will treat the specified tool
+as a custom command and will use a shell eval to run the command with
+the URLs passed as arguments.
+
+NOTE ABOUT KONQUEROR
+--------------------
+
+When 'konqueror' is specified by a command-line option or a
+configuration variable, we launch 'kfmclient' to try to open the HTML
+man page on an already opened konqueror in a new tab if possible.
+
+For consistency, we also try such a trick if 'browser.konqueror.path' is
+set to something like `A_PATH_TO/konqueror`. That means we will try to
+launch `A_PATH_TO/kfmclient` instead.
+
+If you really want to use 'konqueror', then you can use something like
+the following:
+
+------------------------------------------------
+	[web]
+		browser = konq
+
+	[browser "konq"]
+		cmd = A_PATH_TO/konqueror
+------------------------------------------------
+
+Note about git-config --global
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Note that these configuration variables should probably be set using
+the `--global` flag, for example like this:
+
+------------------------------------------------
+$ git config --global web.browser firefox
+------------------------------------------------
+
+as they are probably more user specific than repository specific.
+See linkgit:git-config[1] for more information about this.
+
+GIT
+---
+Part of the linkgit:git[1] suite