QNmeaPositionInfoSource: improve timestamp comparison

Do not use date but only time, if one or both timestamps do not have a
valid date.

Task-number: QTBUG-64699
Change-Id: I0b8827c84c88df257e45204c11bf9d21e8055c4b
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/positioning/qnmeapositioninfosource.cpp b/src/positioning/qnmeapositioninfosource.cpp
index 282f30b4..27711323 100644
--- a/src/positioning/qnmeapositioninfosource.cpp
+++ b/src/positioning/qnmeapositioninfosource.cpp
@@ -243,7 +243,10 @@ static int processSentence(QGeoPositionInfo &info,
             // the sentences containing the full timestamp (e.g., GPRMC) *first* !
             if (infoTime.isValid()) {
                 if (pos.timestamp().time().isValid()) {
-                    if (infoTime != pos.timestamp().time() || infoDate != pos.timestamp().date()) {
+                    if (infoTime != pos.timestamp().time() ||
+                            (infoDate.isValid() // if time is valid but one date or both are not, match only on time
+                             && pos.timestamp().date().isValid()
+                             && infoDate != pos.timestamp().date())) {
                         // Effectively read data for different update, so copy buf into m_nextLine
                         m_nextLine = QByteArray(buf, size);
                         break;