Fix code style and errors

src/widgets/fancytabwidget.cpp

@@ -420,7 +420,7 @@ void FancyTabWidget::paintEvent(QPaintEvent *pe) {
   QColor baseColor = StyleHelper::baseColor();
 
   QRect backgroundRect = rect();
-  backgroundRect.setWidth(((FancyTabBar*)tabBar())->width());
+  backgroundRect.setWidth(tabBar()->width());
   p.fillRect(backgroundRect, baseColor);
 
   // Horizontal gradient over the sidebar from transparent to dark

src/widgets/lineedit.cpp

@@ -54,6 +54,7 @@ ExtendedEditor::ExtendedEditor(QWidget *widget, int extra_right_padding, bool dr
       draw_hint_(draw_hint),
       font_point_size_(widget->font().pointSizeF() - 1),
       is_rtl_(false) {
+
   clear_button_->setIcon(IconLoader::Load("edit-clear-locationbar-ltr"));
   clear_button_->setIconSize(QSize(16, 16));
   clear_button_->setCursor(Qt::ArrowCursor);
@@ -76,6 +77,7 @@ ExtendedEditor::ExtendedEditor(QWidget *widget, int extra_right_padding, bool dr
   widget->connect(clear_button_, SIGNAL(clicked()), widget, SLOT(setFocus()));
 
   UpdateButtonGeometry();
+
 }
 
 void ExtendedEditor::set_hint(const QString& hint) {

src/widgets/multiloadingindicator.cpp

@@ -45,6 +45,7 @@ const int MultiLoadingIndicator::kSpacing = 6;
 
 MultiLoadingIndicator::MultiLoadingIndicator(QWidget *parent)
   : QWidget(parent),
+    task_manager_(nullptr),
     spinner_(new BusyIndicator(this))
 {
   spinner_->move(kHorizontalPadding, kVerticalPadding);

src/widgets/osd_x11.cpp

@@ -160,7 +160,7 @@ void OSD::CallFinished(QDBusPendingCallWatcher *watcher) {
 
   std::unique_ptr<QDBusPendingCallWatcher> w(watcher);
 
-  QDBusPendingReply<uint> reply = *watcher;
+  QDBusPendingReply<uint> reply = *w.get();
   if (reply.isError()) {
     qLog(Warning) << "Error sending notification" << reply.error().name();
     return;

src/widgets/playingwidget.cpp

@@ -217,12 +217,7 @@ void PlayingWidget::SetMode(int mode) {
 
   mode_ = Mode(mode);
 
-  if (mode_ == SmallSongDetails) {
-    fit_cover_width_action_->setEnabled(false);
-  }
-  else {
-    fit_cover_width_action_->setEnabled(true);
-  }
+  fit_cover_width_action_->setEnabled(mode_ != SmallSongDetails);
 
   UpdateHeight();
   UpdateDetailsText();