Test ASS/SSA files containing commas

Unit test with sample file containing commas in subtitle dialogue.

BUG: 461486

tests/dataset/subs-with-commas.ass

+[Script Info]
+Title: Test parsing of lines with commas
+ScaledBorderAndShadow: yes
+
+ScriptType: v4.00+
+Collisions: Normal
+PlayResX: 640
+PlayResY: 360
+Timer: 0.0000
+WrapStyle: 0
+
+[V4+ Styles]
+Format: Name,Fontname,Fontsize,PrimaryColour,SecondaryColour,OutlineColour,BackColour,Bold,Italic,Underline,Strikeout,ScaleX,ScaleY,Spacing,Angle,BorderStyle,Outline,Shadow,Alignment,MarginL,MarginR,MarginV,Encoding
+Style: Default,Trebuchet MS,24,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,1,2,0010,0010,0018,0
+
+[Events]
+Format: Layer,Start,End,Style,Name,MarginL,MarginR,MarginV,Effect,Text
+
+Dialogue: 0,0:00:00.58,0:00:02.98,Default,Alice,0000,0000,0000,,Line with one comma, second part.
+Dialogue: 0,0:00:04.33,0:00:09.10,Default,Bob,0000,0000,0000,,Line with two commas, second part, third part.

tests/subtitlestest.cpp

@@ -105,6 +105,26 @@ TEST_CASE("Read subtitle file", "[Subtitles]")
     }
 #endif
 
+    SECTION("Load ASS file with commas")
+    {
+        QString subtitleFile = sourcesPath + "/dataset/subs-with-commas.ass";
+        QByteArray guessedEncoding = SubtitleModel::guessFileEncoding(subtitleFile);
+        qDebug() << "Guessed encoding: " << guessedEncoding;
+        subtitleModel->importSubtitle(subtitleFile, 0, false, 30.00, 30.00, guessedEncoding);
+        // Ensure all 2 lines are loaded
+        REQUIRE(subtitleModel->rowCount() == 2);
+        QList<SubtitledTime> allSubs = subtitleModel->getAllSubtitles();
+        QStringList subtitlesText;
+        QStringList control = {
+            QStringLiteral("Line with one comma, second part."),
+            QStringLiteral("Line with two commas, second part, third part.")};
+        for (const auto &s : qAsConst(allSubs)) {
+            subtitlesText << s.subtitle();
+        }
+        // Ensure that non-ASCII characters are read correctly
+        CHECK(subtitlesText == control);
+    }
+
     SECTION("Load a broken subtitle file")
     {
         QString subtitleFile = sourcesPath + "/dataset/02.srt";