fix: reset() in StrictCsvParser left parser-state fields stale

reset() restored only startingLineNumber and the buffer, but not
lines, status, or finished. IndexedCsvReader.readPage() calls
reset() before each page; the leaked state then corrupted the
next page's results:

  - A previous page that ended on a multi-line quoted record
    left lines >= 2. The next page's parse() did
    startingLineNumber += lines, reporting subsequent records
    on the wrong line number (regression-tested).
  - A previous page that exhausted its data set finished = true.
    A later readPage() on the same reader then returned an empty
    list because parse() short-circuited on the leaked finished
    (regression-tested).

Also reset status to STATUS_RESET so reset() truly restores the
initial parser state rather than partially.

Author: osiegmar

lib/src/intTest/java/blackbox/reader/IndexedCsvReaderTest.java

@@ -110,6 +110,40 @@ void unicode() throws IOException {
         }
     }
 
+    @Test
+    void resetClearsLineCounterBetweenPages() throws IOException {
+        // Page 0 contains a 2-line quoted field, so the parser bumps `lines` to 2.
+        // Page 1 must report its record's startingLineNumber from a fresh state,
+        // not inherit the leaked `lines` from the previous page.
+        try (var csv = buildSinglePage("\"a\nb\"\nc")) {
+            assertThat(csv.readPage(0))
+                .singleElement(CsvRecordAssert.CSV_RECORD)
+                .isStartingLineNumber(1).fields().containsExactly("a\nb");
+            assertThat(csv.readPage(1))
+                .singleElement(CsvRecordAssert.CSV_RECORD)
+                .isStartingLineNumber(3).fields().containsExactly("c");
+        }
+    }
+
+    @Test
+    void resetClearsFinishedFlag() throws IOException {
+        // Reading the partial last page calls parse() pageSize times;
+        // the trailing call hits EOF and sets parser.finished = true.
+        // A subsequent re-read of any page must still succeed; the leaked
+        // `finished` flag would otherwise cause parse() to short-circuit
+        // and return an empty list.
+        final var icrb = IndexedCsvReader.builder().pageSize(2);
+        try (var csv = icrb.ofCsvRecord(prepareTestFile("a\nb\nc"))) {
+            assertThat(csv.readPage(1))
+                .singleElement(CsvRecordAssert.CSV_RECORD)
+                .fields().containsExactly("c");
+            assertThat(csv.readPage(0))
+                .satisfiesExactly(
+                    rec1 -> CsvRecordAssert.assertThat(rec1).fields().containsExactly("a"),
+                    rec2 -> CsvRecordAssert.assertThat(rec2).fields().containsExactly("b"));
+        }
+    }
+
     @Test
     void explicitCharset() throws IOException {
         try (var csv = singlePageBuilder().ofCsvRecord(prepareTestFile("abc\nüöä\nabc"), StandardCharsets.UTF_8)) {

lib/src/main/java/de/siegmar/fastcsv/reader/StrictCsvParser.java

@@ -345,6 +345,9 @@ public long getStartingLineNumber() {
     public void reset(final long startingLineNumber) {
         this.startingLineNumber = startingLineNumber;
         csvBuffer.reset();
+        lines = 1;
+        status = STATUS_RESET;
+        finished = false;
     }
 
     @Override