TestLexers failed to find per-line folding bugs because it reused the…

… document and

lexer object from successful whole document fold for the per-line fold.
Fixed by creating a new document and lexer for the per-line lexing and folding.
This showed there are problems with the current Dart, F#, and Julia folders as well as
the new Zig lexer in #267.

test/TestLexers.cxx

@@ -897,17 +897,22 @@ bool TestFile(const std::filesystem::path &path, const PropertyMap &propertyMap)
 	const std::optional<int> perLineDisable = propertyMap.GetPropertyValue("testlexers.per.line.disable");
 	const bool disablePerLineTests = perLineDisable.value_or(false);
 
+	plex->Release();
+
 	// Test line by line lexing/folding
 	if (success && !disablePerLineTests) {
-		doc.Set(text);
-		StyleLineByLine(doc, plex);
-		const auto [styledTextNewPerLine, foldedTextNewPerLine] = MarkedAndFoldedDocument(pdoc);
+		TestDocument docPerLine;
+		docPerLine.Set(text);
+		Scintilla::ILexer5 *plexPerLine = Lexilla::MakeLexer(*language);
+		if (!SetProperties(plexPerLine, *language, propertyMap, path)) {
+			return false;
+		}
+		StyleLineByLine(docPerLine, plexPerLine);
+		const auto [styledTextNewPerLine, foldedTextNewPerLine] = MarkedAndFoldedDocument(&docPerLine);
 		success = success && CheckSame(styledText, styledTextNewPerLine, "per-line styles", suffixStyled, path);
 		success = success && CheckSame(foldedText, foldedTextNewPerLine, "per-line folds", suffixFolded, path);
 	}
 
-	plex->Release();
-
 	if (success) {
 		Scintilla::ILexer5 *plexCRLF = Lexilla::MakeLexer(*language);
 		SetProperties(plexCRLF, *language, propertyMap, path.filename().string());

test/examples/dart/SciTE.properties

@@ -18,3 +18,5 @@ keywords3.*.dart=fBigInt Comparable Comparator Completer DateTime Deprecated \
  SocketException SplayTreeMap SplayTreeSet StackTrace Stopwatch Stream String \
  StringBuffer StringSink Symbol SystemHash Timer Type Uri UriData WeakReference
 keywords4.*.dart=Spacecraft
+
+testlexers.per.line.disable=1

test/examples/fsharp/SciTE.properties

@@ -40,3 +40,5 @@ uint uint8 uint16 uint32 uint64 unit void voidptr voption
 
 fold.fsharp.preprocessor=1
 fold.comment=1
+
+testlexers.per.line.disable=1

test/examples/julia/SciTE.properties

@@ -2,3 +2,4 @@ lexer.*.jl=julia
 keywords.*.jl=const end for function in where
 keywords2.*.jl=Int Number
 keywords3.*.jl=true
+testlexers.per.line.disable=1