nodeparamview: added icon to "edit text in viewer" button

app/ui/icons/icons.cpp

@@ -91,6 +91,7 @@ QIcon icon::EyeOpened;
 QIcon icon::EyeClosed;
 QIcon icon::LockOpened;
 QIcon icon::LockClosed;
+QIcon icon::Pencil;
 
 void icon::LoadAll(const QString& theme)
 {
@@ -161,6 +162,8 @@ void icon::LoadAll(const QString& theme)
   EyeClosed = Create(theme, "eye-closed");
   LockOpened = Create(theme, "lock-opened");
   LockClosed = Create(theme, "lock-closed");
+
+  Pencil = Create(theme, "text-edit");
 }
 
 QIcon icon::Create(const QString& theme, const QString &name)

app/ui/icons/icons.h

@@ -103,6 +103,7 @@ extern QIcon EyeOpened;
 extern QIcon EyeClosed;
 extern QIcon LockOpened;
 extern QIcon LockClosed;
+extern QIcon Pencil;
 
 /**
  * @brief Create an icon object loaded from file

app/widget/nodeparamview/nodeparamviewtextedit.cpp

@@ -45,6 +45,7 @@ NodeParamViewTextEdit::NodeParamViewTextEdit(QWidget *parent) :
   connect(edit_btn_, &QPushButton::clicked, this, &NodeParamViewTextEdit::ShowTextDialog);
 
   edit_in_viewer_btn_ = new QPushButton(tr("Edit In Viewer"));
+  edit_in_viewer_btn_->setIcon(icon::Pencil);
   layout->addWidget(edit_in_viewer_btn_);
   connect(edit_in_viewer_btn_, &QPushButton::clicked, this, &NodeParamViewTextEdit::RequestEditInViewer);