Fix razor cursor sometimes not appearing and not adapting to color theme

CCBUG: 357520

src/timeline/customtrackview.cpp

@@ -39,6 +39,7 @@
 #include "mainwindow.h"
 #include "transitionhandler.h"
 #include "project/clipmanager.h"
+#include "utils/KoIconUtils.h"
 #include "effectslist/initeffects.h"
 #include "dialogs/profilesdialog.h"
 #include "ui_keyframedialog_ui.h"
@@ -158,7 +159,7 @@ CustomTrackView::CustomTrackView(KdenliveDoc *doc, Timeline *timeline, CustomTra
     m_thumbsTimer.setInterval(500);
     m_thumbsTimer.setSingleShot(true);
 
-    QIcon razorIcon = QIcon::fromTheme("edit-cut");
+    QIcon razorIcon = KoIconUtils::themedIcon(QStringLiteral("edit-cut"));
     m_razorCursor = QCursor(razorIcon.pixmap(32, 32));
     m_spacerCursor = QCursor(Qt::SplitHCursor);
     connect(m_document->renderer(), SIGNAL(prepareTimelineReplacement(QString)), this, SLOT(slotPrepareTimelineReplacement(QString)), Qt::DirectConnection);
@@ -7413,6 +7414,8 @@ void CustomTrackView::updatePalette()
         pen1.setColor(line);
         m_cursorLine->setPen(pen1);
     }
+    QIcon razorIcon = KoIconUtils::themedIcon(QStringLiteral("edit-cut"));
+    m_razorCursor = QCursor(razorIcon.pixmap(32, 32));
 }
 
 void CustomTrackView::removeTipAnimation()

src/timeline/timeline.cpp

@@ -812,7 +812,8 @@ void Timeline::updatePalette()
     p.setColor(QPalette::Button, norm);
     QColor col = scheme.background().color();
     QColor col2 = scheme.foreground().color();
-    headers_container->setStyleSheet(QString("QLineEdit { background-color: transparent;color: %1;} QLineEdit:hover{ background-color: %2;} QLineEdit:focus { background-color: %2;}").arg(col2.name()).arg(col.name()));
+    headers_container->setStyleSheet(QStringLiteral("QLineEdit { background-color: transparent;color: %1;} QLineEdit:hover{ background-color: %2;} QLineEdit:focus { background-color: %2;}").arg(col2.name()).arg(col.name()));
+    m_trackview->updatePalette();
 }
 
 void Timeline::refreshIcons()