Treat svgz file as a vector image

[mercuree]

Musescore suddenly supports compressed svg files (with .svgz extension) if you add them via drag&drop.
This PR fixes a situation where compressed svgs are incorrectly treated as raster images, which causes incorrect "pixelated" rendering and makes musescore slow.
Before:

After:

Explanations:
A compressed svg file is a regular gzipped svg.
Musescore accepts and renders svg files in these formats:

• plain svg with .svg extension (correct rendering)
• compressed svg with .svg extension (correct rendering)
• compressed svg with .svgz extension (incorrect raster rendering, fixed by this PR)
• compressed svg with .svg.gz extension (incorrect raster rendering, not covered by this PR)

• I signed the CLA
• The title of the PR describes the problem it addresses
• Each commit's message describes its purpose and effects, and references the issue it resolves
• If changes are extensive, there is a sequence of easily reviewable commits
• The code in the PR follows the coding rules
• There are no unnecessary changes
• The code compiles and runs on my machine, preferably after each commit individually
• I created a unit test or vtest to verify the changes I made (if applicable)

[Jojo-Schmitz]

why not adding ".svg.gz" too?

[cbjeukendrup]

Probably because the suffix will then be considered to be gz so withSuffix("svg.gz") doesn't work

[Jojo-Schmitz]

Some code (from Mu3):

void MIconEngine::addFile(const QString &fileName, const QSize &, QIcon::Mode mode, QIcon::State state)
      {
      if (!fileName.isEmpty()) {
            QString abs = fileName;
            if (fileName.at(0) != QLatin1Char(':'))
                  abs = QFileInfo(fileName).absoluteFilePath();
            if (abs.endsWith(QLatin1String(".svg"), Qt::CaseInsensitive)
                || abs.endsWith(QLatin1String(".svgz"), Qt::CaseInsensitive)
                || abs.endsWith(QLatin1String(".svg.gz"), Qt::CaseInsensitive))
                  {
                  QSvgRenderer renderer(abs);
                  if (renderer.isValid()) {
                        d->stepSerialNum();
                        d->svgFiles.insert(d->hashKey(mode, state), abs);
                        }
                  }

[mercuree]

why not adding ".svf.gz" too?

Initially I added support for .svg.gz, but it turned out that the file was still saved as .gz inside mscz. When you open the project, it will again be treated as a raster image. Additional changes need to be made, which is inconsistent with my almost zero C++ knowledge😁
Feel free to create more proper and complete PR and I will close mine

P.S.
MS3 has the same issue with drag&drop

[Jojo-Schmitz]

P.S. MS3 has the same issue with drag&drop

Yes, I'm currently backporting this to Mu3. And found a few other places where we could/should support *.svgz, in file.cpp and in palette.cpp

[Jojo-Schmitz]

in Mu4 it is in

MuseScore/src/notation/internal/notationactioncontroller.cpp

Lines 1244 to 1245 in b38394f

	std::vector<std::string> filter = { muse::trc("notation", "All Supported Files") + " (*.svg *.jpg *.jpeg *.png *.bmp *.tif *.tiff)",
	muse::trc("notation", "Scalable Vector Graphics") + " (*.svg)",

,

MuseScore/src/notation/internal/notationinteraction.cpp

Line 4291 in b38394f

{ "svg", ImageType::SVG },

and

MuseScore/src/palette/view/widgets/palettewidget.cpp

Line 820 in b38394f

if (suffix == "svg"

[mercuree]

Thank you, @Jojo-Schmitz! Added your changes. Everything seems to be working

[zacjansheski]

Tested on MacOS 14, Windows 11, Ubuntu 22.04.3. Approved