lilypond-book robustness: ensure EOL at the end of @verbatim

[lilypond.git] / Documentation / user / tweaks.itely

diff --git a/Documentation/user/tweaks.itely b/Documentation/user/tweaks.itely
index dd38806ad60c0391b370663f8b2c20debcf52853..304fe5aa75dd4f5424f9d3347e0f5adb1f09881f 100644 (file)
--- a/Documentation/user/tweaks.itely
+++ b/Documentation/user/tweaks.itely
@@ -183,13 +183,13 @@ properties.
 We have already met the commands @code{\set} and @code{\with}, used to
 change the properties of @strong{contexts} and to remove and add
 @strong{engravers}, in @ref{Modifying context properties}, and
-@ref{Adding and removing engravers}.  We now must meet some more
+@ref{Adding and removing engravers}.  We must now introduce some more
 important commands.
 
 The command to change the properties of @strong{layout objects} is
 @code{\override}.  Because this command has to modify
 internal properties deep within LilyPond its syntax is not
-as simple as the commands you have met so far.  It needs to
+as simple as the commands you have used so far.  It needs to
 know precisely which property of which object in which context
 has to be modified, and what its new value is to be.  Let's see
 how this is done.
@@ -819,16 +819,16 @@ from arbitrary text strings, which would appear as @code{"a text
 string"}; for more details about symbols and strings, see @ref{Scheme
 tutorial}.
 
-Ok, so the @code{\override} command we need to print the lyrics
-in italics should be
+So we see that the @code{\override} command needed to print the lyrics
+in italics is:
 
 @example
 \override LyricText #'font-shape = #'italic
 @end example
 
 @noindent
-and this should be placed just in front of and close to the
-lyrics which it should affect, like this:
+This should be placed just in front of the lyrics we wish to affect,
+like so:
 
 @cindex font-shape property, example
 @cindex italic, example
@@ -1034,7 +1034,7 @@ gives a list of Contexts in which the bar engraver operates.  All of
 them are of the type @code{Staff}, so the reason the @code{\override}
 command failed to work as expected is because @code{Barline} is not in
 the default @code{Voice} context.  If the context is specified
-wrongly, the command simply does not work.  No error message is
+incorrectly, the command simply does not work.  No error message is
 produced, and nothing is logged in the log file.  Let's try correcting
 it by adding the correct context:
 
@@ -1053,6 +1053,22 @@ it by adding the correct context:
 
 Now the bar lines have vanished.
 
+Note, though, that setting the @code{stencil} property to @code{#f}
+will cause errors when the dimensions of the object are required for
+correct processing.  For example, errors will be generated if the
+@code{stencil} property of the @code{NoteHead} object is set to
+@code{#f}.  If this is the case, you can instead use the
+@code{point-stencil} function, which sets the stencil to a object
+with zero size:
+
+@lilypond[quote,verbatim,relative=2]
+{
+  c c
+  \once \override NoteHead #'stencil = #point-stencil
+  c c
+}
+@end lilypond
+
 @subheading break-visibility
 
 @cindex break-visibility property
@@ -1808,7 +1824,7 @@ notes of a chord, as shown:
 @end lilypond
 
 @noindent
-but this may be overriden to manually force all or any of the
+but this may be overridden to manually force all or any of the
 individual fingering numbers above or below:
 
 @cindex fingering example