[llvm-cov][CoverageView] minor fix/improvement to HTML and text coverage output (#80952)

1. add the missing condition for MC/DC in hasSubViews()
2. add style for selected line
3. remove name="Ln" attribute in the link within MC/DC views
4. remove color for \n

Author: whentojump

Diff for: llvm/test/tools/llvm-cov/mcdc-general-none.test

@@ -53,7 +53,7 @@
 // RUN: rm -rf %t.html.dir
 // RUN: llvm-cov show --show-mcdc-summary --show-mcdc %S/Inputs/mcdc-general.o -instr-profile %t.profdata -path-equivalence=.,%S/Inputs -format html -o %t.html.dir
 // RUN: FileCheck -check-prefix=HTML -input-file=%t.html.dir/coverage/mcdc-general.cpp.html %s
-// HTML-COUNT-4: MC/DC Decision Region (<span class='line-number'><a name='L{{[0-9]+}}' href='#L{{[0-9]+}}'><span>
+// HTML-COUNT-4: MC/DC Decision Region (<span class='line-number'><a href='#L{{[0-9]+}}'><span>
 
 // RUN: FileCheck -check-prefix HTML-INDEX -input-file %t.html.dir/index.html %s
 // HTML-INDEX-LABEL: <table>

Diff for: llvm/test/tools/llvm-cov/mcdc-general.test

@@ -119,7 +119,7 @@
 // RUN: rm -rf %t.html.dir
 // RUN: llvm-cov show --show-mcdc-summary --show-mcdc %S/Inputs/mcdc-general.o -instr-profile %t.profdata -path-equivalence=.,%S/Inputs -format html -o %t.html.dir
 // RUN: FileCheck -check-prefix=HTML -input-file=%t.html.dir/coverage/mcdc-general.cpp.html %s
-// HTML-COUNT-4: MC/DC Decision Region (<span class='line-number'><a name='L{{[0-9]+}}' href='#L{{[0-9]+}}'><span>
+// HTML-COUNT-4: MC/DC Decision Region (<span class='line-number'><a href='#L{{[0-9]+}}'><span>
 
 // RUN: FileCheck -check-prefix HTML-INDEX -input-file %t.html.dir/index.html %s
 // HTML-INDEX-LABEL: <table>

Diff for: llvm/tools/llvm-cov/SourceCoverageView.cpp

@@ -139,7 +139,7 @@ bool SourceCoverageView::shouldRenderRegionMarkers(
 
 bool SourceCoverageView::hasSubViews() const {
   return !ExpansionSubViews.empty() || !InstantiationSubViews.empty() ||
-         !BranchSubViews.empty();
+         !BranchSubViews.empty() || !MCDCSubViews.empty();
 }
 
 std::unique_ptr<SourceCoverageView>

Diff for: llvm/tools/llvm-cov/SourceCoverageViewHTML.cpp

@@ -246,6 +246,9 @@ tr:hover {
 tr:last-child {
   border-bottom: none;
 }
+tr:has(> td >a:target) > td.code > pre {
+  background-color: #ffa;
+}
 )";
 
 const char *EndHeader = "</head>";
@@ -990,15 +993,13 @@ void SourceCoverageViewHTML::renderMCDCView(raw_ostream &OS, MCDCView &MRV,
     std::string ColNoStr = Twine(DecisionRegion.ColumnStart).str();
     std::string TargetName = "L" + LineNoStr;
     OS << tag("span",
-              a("#" + TargetName, tag("span", LineNoStr + ":" + ColNoStr),
-                TargetName),
+              a("#" + TargetName, tag("span", LineNoStr + ":" + ColNoStr)),
               "line-number") +
               ") to (";
     LineNoStr = utostr(uint64_t(DecisionRegion.LineEnd));
     ColNoStr = utostr(uint64_t(DecisionRegion.ColumnEnd));
     OS << tag("span",
-              a("#" + TargetName, tag("span", LineNoStr + ":" + ColNoStr),
-                TargetName),
+              a("#" + TargetName, tag("span", LineNoStr + ":" + ColNoStr)),
               "line-number") +
               ")\n\n";
 

Diff for: llvm/tools/llvm-cov/SourceCoverageViewText.cpp

@@ -382,7 +382,8 @@ void SourceCoverageViewText::renderMCDCView(raw_ostream &OS, MCDCView &MRV,
     colored_ostream(OS, raw_ostream::RED,
                     getOptions().Colors && Record.getPercentCovered() < 100.0,
                     /*Bold=*/false, /*BG=*/true)
-        << format("%0.2f", Record.getPercentCovered()) << "%\n";
+        << format("%0.2f", Record.getPercentCovered()) << "%";
+    OS << "\n";
     renderLinePrefix(OS, ViewDepth);
     OS << "\n";
   }