Fix uninitialized variables

src/context/contextalbum.cpp

@@ -54,6 +54,7 @@ ContextAlbum::ContextAlbum(QWidget *parent) :
     timeline_fade_(new QTimeLine(1000, this)),
     image_strawberry_(":/pictures/strawberry.png"),
     image_original_(image_strawberry_),
+    pixmap_previous_opacity_(0),
     prev_width_(width()) {
 
   setObjectName("context-widget-album");

src/context/contextalbumsview.cpp

@@ -115,6 +115,17 @@ ContextAlbumsView::ContextAlbumsView(QWidget *parent)
     : AutoExpandingTreeView(parent),
       app_(nullptr),
       context_menu_(nullptr),
+      load_(nullptr),
+      add_to_playlist_(nullptr),
+      add_to_playlist_enqueue_(nullptr),
+      open_in_new_playlist_(nullptr),
+      organize_(nullptr),
+#ifndef Q_OS_WIN
+      copy_to_device_(nullptr),
+#endif
+      edit_track_(nullptr),
+      edit_tracks_(nullptr),
+      show_in_browser_(nullptr),
       is_in_keyboard_search_(false),
       model_(nullptr)
   {

src/context/contextview.cpp

@@ -128,6 +128,8 @@ ContextView::ContextView(QWidget *parent) :
     spacer_bottom_(new QSpacerItem(20, 20, QSizePolicy::Expanding, QSizePolicy::Expanding)),
     lyrics_tried_(false),
     lyrics_id_(-1),
+    font_size_headline_(0),
+    font_size_normal_(0),
     prev_width_(0)
   {