Allow slurs instead of brackets with tuplets

Allow slurs instead of brackets with tuplets

Older editions often use slurs with tuplets.  This patch
creates a new property ('tuplet-slur'), which toggles this
notation style.  Note that 'bracket-visibility must be set
to #t for the slurs to appear with beamed notes.

(In the future, 'bracket-visibility might automatically be set
to #t.)

[lemzwerg, 2019-10-06 16:03:41]

Ligature brackets fix.

[Malte Meyn, 2019-10-07 14:02:46]

https://codereview.appspot.com/581110043/diff/569040043/input/regression/tupl...
File input/regression/tuplet-slur-tweaks.ly (right):

https://codereview.appspot.com/581110043/diff/569040043/input/regression/tupl...
input/regression/tuplet-slur-tweaks.ly:1: \version "2.19.55"
Shouldn’t this be 2.21.0?

https://codereview.appspot.com/581110043/diff/569040043/input/regression/tupl...
File input/regression/tuplet-slurs.ly (right):

https://codereview.appspot.com/581110043/diff/569040043/input/regression/tupl...
input/regression/tuplet-slurs.ly:1: \version "2.19.55"
2.21.0

[dak, 2019-10-07 15:01:56]

https://codereview.appspot.com/581110043/diff/569040043/input/regression/tupl...
File input/regression/tuplet-slur-tweaks.ly (right):

https://codereview.appspot.com/581110043/diff/569040043/input/regression/tupl...
input/regression/tuplet-slur-tweaks.ly:1: \version "2.19.55"
On 2019/10/07 14:02:46, Malte Meyn wrote:
> Shouldn’t this be 2.21.0?

Why?

[Malte Meyn, 2019-10-07 15:26:21]

On 2019/10/07 15:01:56, dak wrote:
>
https://codereview.appspot.com/581110043/diff/569040043/input/regression/tupl...
> File input/regression/tuplet-slur-tweaks.ly (right):
> 
>
https://codereview.appspot.com/581110043/diff/569040043/input/regression/tupl...
> input/regression/tuplet-slur-tweaks.ly:1: \version "2.19.55"
> On 2019/10/07 14:02:46, Malte Meyn wrote:
> > Shouldn’t this be 2.21.0?
> 
> Why?

IIUC the version should always be the first one which supports the syntax and
features used. Is this incorrect?

[dak, 2019-10-07 16:21:41]

lilypond@maltemeyn.de writes:

> On 2019/10/07 15:01:56, dak wrote:
>
>
https://codereview.appspot.com/581110043/diff/569040043/input/regression/tupl...
>> File input/regression/tuplet-slur-tweaks.ly (right):
>
>
>
https://codereview.appspot.com/581110043/diff/569040043/input/regression/tupl...
>> input/regression/tuplet-slur-tweaks.ly:1: \version "2.19.55"
>> On 2019/10/07 14:02:46, Malte Meyn wrote:
>> > Shouldn’t this be 2.21.0?
>
>> Why?
>
> IIUC the version should always be the first one which supports the
> syntax and features used. Is this incorrect?
>
> https://codereview.appspot.com/581110043/

Syntax yes, features not necessarily.  It should be a version that
compiles (and does not produce warnings, like for non-existing
properties) so that one can compare regtests if desired.  Does this
exercise new features, or does it only change the results of existing
ones?

-- 
David Kastrup

[lemzwerg, 2019-10-08 09:23:05]

Fix regression snippet version strings.