Tweak default symbol for overviews

src/core/layout/qgslayoutitemmapoverview.cpp

@@ -38,11 +38,10 @@ QgsLayoutItemMapOverview::QgsLayoutItemMapOverview( const QString &name, QgsLayo
 void QgsLayoutItemMapOverview::createDefaultFrameSymbol()
 {
   QgsStringMap properties;
-  properties.insert( QStringLiteral( "color" ), QStringLiteral( "255,0,0,255" ) );
+  properties.insert( QStringLiteral( "color" ), QStringLiteral( "255,0,0,75" ) );
   properties.insert( QStringLiteral( "style" ), QStringLiteral( "solid" ) );
   properties.insert( QStringLiteral( "style_border" ), QStringLiteral( "no" ) );
   mFrameSymbol.reset( QgsFillSymbol::createSimple( properties ) );
-  mFrameSymbol->setOpacity( 0.3 );
 }
 
 void QgsLayoutItemMapOverview::draw( QPainter *painter )

tests/src/python/test_qgslayoutmap.py

@@ -84,6 +84,7 @@ class TestQgsComposerMap(unittest.TestCase):
         overviewMap.setExtent(myRectangle2)
         overviewMap.overview().setFrameMap(self.map)
         checker = QgsLayoutChecker('composermap_overview', self.layout)
+        checker.setColorTolerance(6)
         checker.setControlPathPrefix("composer_mapoverview")
         myTestResult, myMessage = checker.testLayout()
         self.layout.removeLayoutItem(overviewMap)