Add a border on top of the find toolbar

It was missing.

src/plugins/find/findtoolbar.cpp

@@ -38,6 +38,7 @@
 #include <coreplugin/coreconstants.h>
 #include <coreplugin/findplaceholder.h>
 #include <coreplugin/icore.h>
+#include <coreplugin/stylehelper.h>
 #include <coreplugin/actionmanager/actionmanager.h>
 #include <coreplugin/actionmanager/actioncontainer.h>
 #include <coreplugin/actionmanager/command.h>
@@ -224,6 +225,16 @@ FindToolBar::~FindToolBar()
 {
 }
 
+void FindToolBar::paintEvent(QPaintEvent *event)
+{
+    QToolBar::paintEvent(event);
+
+    QPainter p(this);
+    const QRect r = rect();
+    p.setPen(StyleHelper::borderColor());
+    p.drawLine(r.topLeft(), r.topRight());
+}
+
 bool FindToolBar::eventFilter(QObject *obj, QEvent *event)
 {
     if ((obj == m_ui.findEdit || obj == m_findCompleter->popup())

src/plugins/find/findtoolbar.h

@@ -58,6 +58,8 @@ public:
 
     void invokeClearResults();
 
+    void paintEvent(QPaintEvent *event);
+
 private slots:
     void invokeFindNext();
     void invokeFindPrevious();