Avoid superfluous re-run when specific section is selected

Fixes #1394

examples/300-FilteredSection.cpp

@@ -0,0 +1,35 @@
+// Provide a basis to check whether section selection via the `-c` command line
+// option works as intended.
+
+#define CATCH_CONFIG_MAIN
+#include <catch2/catch.hpp>
+
+bool previouslyRun = false;
+bool previouslyRunNested = false;
+
+TEST_CASE( "#1394" ) {
+    // -- Don't re-run after specified section is done
+    REQUIRE(previouslyRun == false);
+
+    SECTION( "RunSection" ) {
+        previouslyRun = true;
+    }
+    SECTION( "SkipSection" ) {
+        // cause an error if this section is called because it shouldn't be
+        REQUIRE(1 == 0);
+    }
+}
+
+TEST_CASE( "#1394 nested" ) {
+    REQUIRE(previouslyRunNested == false);
+
+    SECTION( "NestedRunSection" ) {
+        SECTION( "s1" ) {
+            previouslyRunNested = true;
+        }
+    }
+    SECTION( "NestedSkipSection" ) {
+        // cause an error if this section is called because it shouldn't be
+        REQUIRE(1 == 0);
+    }
+}

examples/CMakeLists.txt

@@ -21,6 +21,7 @@ set( REPORTER_HEADER_DIR ${CATCH_DIR}/include/reporters )
 set( SOURCES_SINGLE_FILE
     010-TestCase.cpp
     231-Cfg-OutputStreams.cpp
+    300-FilteredSection.cpp
 )
 
 # multiple-file modules:

examples/runFilteredSection.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# make sure single-file header was regenerated
+../scripts/generateSingleHeader.py
+
+# run Test case with specified section to trigger bug #1394
+../cmake-build-debug/examples/300-FilteredSection \#1394 -c RunSection
+../cmake-build-debug/examples/300-FilteredSection \#1394\ nested -c NestedRunSection -c s1