Cleaning logClusters for line separator layout shortcut

In some cases the logClusters are accessed, but we don't have actual
glyphs generated for them.

Task-number: QTBUG-23704
Change-Id: I719c183e17429941b32dd37bf8a4e5497edda6fe

1 files changed, 3 insertions, 1 deletions

diff --git a/src/gui/text/qtextengine_mac.cpp b/src/gui/text/qtextengine_mac.cpp
index 7566d444c5..ead2806b82 100644
--- a/src/gui/text/qtextengine_mac.cpp
+++ b/src/gui/text/qtextengine_mac.cpp
@@ -608,8 +608,10 @@ void QTextEngine::shapeTextMac(int item) const
     // Skip shaping of line or paragraph separators since we are not
     // going to draw them anyway
     if (si.analysis.flags == QScriptAnalysis::LineOrParagraphSeparator
-        && !(option.flags() & QTextOption::ShowLineAndParagraphSeparators))
+        && !(option.flags() & QTextOption::ShowLineAndParagraphSeparators)) {
+        memset(log_clusters, 0, len * sizeof(unsigned short));
         goto cleanUp;
+    }
 
     if (!fe->stringToCMap(str, len, &g, &num_glyphs, flags, log_clusters, attributes(), &si)) {
         ensureSpace(num_glyphs);