QT: Redraw everything on Qt Paint request.

xtt/lib/flow/qt/flow_draw_qt.cqt

@@ -623,6 +623,7 @@ int FlowDrawQt::event_handler(QEvent* event, QWidget* target)
     case QEvent::Paint:
     case QEvent::UpdateRequest: {
       QPaintEvent* paintEvent = ((QPaintEvent*)event);
+      basectx->clear();
       sts = basectx->event_handler(flow_eEvent_Exposure, paintEvent->rect().x(),
           paintEvent->rect().y(), paintEvent->rect().width(),
           paintEvent->rect().height());
@@ -741,7 +742,6 @@ int FlowDrawQt::event_handler(QEvent* event, QWidget* target)
       } else if (wheelEvent->delta() < 0) {
         sts = basectx->event_handler(flow_eEvent_ScrollDown, 0, 0, 0, 0);
       }
-      basectx->clear(); // For some reason, flow does not redraw after scrolling
       break;
     }
     default:

xtt/lib/glow/qt/glow_draw_qt.cqt

@@ -690,6 +690,7 @@ int GlowDrawQt::event_handler(QEvent* event, QWidget* target)
     case QEvent::Paint:
     case QEvent::UpdateRequest: {
       QPaintEvent* paintEvent = ((QPaintEvent*)event);
+      ctx->clear(&ctx->mw);
       sts = ctx->event_handler(glow_eEvent_Exposure, paintEvent->rect().x(),
           paintEvent->rect().y(), paintEvent->rect().width(),
           paintEvent->rect().height());
@@ -808,7 +809,6 @@ int GlowDrawQt::event_handler(QEvent* event, QWidget* target)
         sts = ctx->event_handler(
             glow_eEvent_ScrollDown, wheelEvent->x(), wheelEvent->y(), 0, 0);
       }
-      basectx->clear(); // For some reason, glow does not redraw after scrolling
       break;
     }
     default: