Boolean if this is the first action within the app bar. This is really just
								used to automatically right-align all the actions by applying
							margin-left: auto to this action.
Boolean if this component should inherit the base color provided by the
								AppBar.  When this value is omitted, this will be enabled when the theme
							is not "clear" and not "default"
Boolean if this is the last action within the app bar's row. This will just
							apply the $rmd-app-bar-lr-margin as margin-right.
NOTE: This should not be used when using an overflow menu.
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An optional className to merge with the nav classes.