Trailing Whitespace
It is easy to leave unnecessary spaces at the end of a line without
realizing it. In most cases, this trailing whitespace has no
effect, but there are special circumstances where it matters.
You can make trailing whitespace visible on the screen by setting the
buffer-local variable show-trailing-whitespace to t. Then
Emacs displays trailing whitespace in the face
trailing-whitespace.
Trailing whitespace is defined as spaces or tabs at the end of a
line. But trailing whitespace is not displayed specially if point is
at the end of the line containing the whitespace. (Doing that looks
ugly while you are typing in new text, and the location of point is
enough in that case to show you that the spaces are present.)
To delete all trailing whitespace within the current buffer's
restriction (see Narrowing), type M-x
delete-trailing-whitespace <RET>. (This command does not remove
the form-feed characters.)
Emacs can indicate empty lines at the end of the buffer with a
special bitmap on the left fringe of the window. To enable this
feature, set the buffer-local variable indicate-empty-lines to
a non-nil value. The default value of this variable is
controlled by the variable default-indicate-empty-lines;
by setting that variable, you can enable or disable this feature
for all new buffers.
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