let dynamic/tempo symbols auto-resize to surrounding text

[Nick-Mazuk]

Follow up to resolve some of the comments brought up in #9359 after it was merged.

Instead of having separate font sizes for dynamic/tempo symbols, the symbols will automatically resize given the surrounding context text sizes.

One other change: default dynamics font size is now 10pt instead of 11pt.

[Jojo-Schmitz]

The backport (#9387) also shows a failing mtest (due to the changed default for dynamics size, easily fixed) and as such reveals that this particular mtest is missing from master, although the test file does exist (https://github.com/musescore/MuseScore/tree/master/src/importexport/musicxml/tests/data/testMeasureStyleSlash_ref.mscx).

[Jojo-Schmitz]

So you want it twice as big as the (new) default for dynamicsFontSize.
Why not twice as big as the actual dynamicsFontSize?
Wouzldn't that render this setting (in the EditStyle dialog) completyle useless?

[Jojo-Schmitz]

Similar question here.

[Jojo-Schmitz]

I got the 2.x import to work properly (finally):

diff --git a/src/engraving/libmscore/textbase.cpp b/src/engraving/libmscore/textbase.cpp
index 800189f797..6f52fba576 100644
--- a/src/engraving/libmscore/textbase.cpp
+++ b/src/engraving/libmscore/textbase.cpp
@@ -961,11 +961,13 @@ mu::draw::Font TextFragment::font(const TextBase* t) const
     QString family;
     if (format.fontFamily() == "ScoreText") {
         if (t->parent() && t->isDynamic()) {
-            family = t->score()->scoreFont()->fontByName(t->score()->styleSt(Sid::MusicalSymbolFont))->family();
-            m = t->score()->styleV(Sid::dynamicsSymbolFontSize).toReal() * t->mag();
+            family = t->score()->scoreFont()->fontByName(t->score()->styleSt(Sid::MusicalTextFont).replace(" Text", ""))->family();
+            // to keep desired size ratio (based on 20pt symbol size to 10pt text size)
+            m *= 2;
         } else if (t->parent() && t->isTempoText()) {
             family = t->score()->styleSt(Sid::MusicalTextFont);
-            m = t->score()->styleV(Sid::tempoSymbolFontSize).toReal();
+            // to keep desired size ratio (based on 20pt symbol size to 12pt text size)
+            m *= 5.0 / 3.0;
         } else {
             family = t->score()->styleSt(Sid::MusicalTextFont);
         }

I.e. by using the MusicalTextFont setting, and converting that into the corresponding MusyicalSymbolFont!

family = t->score()->scoreFont()->fontByName(t->score()->styleSt(Sid::MusicalTextFont).replace(" Text", ""))->family();

As the MusicalTextFont deterimines the look of Dynamics in MuseScore 1, 2 and 3, this to me is the way to go.

See #9427