hopefully take care of some annoying bugs

components/channels.cpp

@@ -46,13 +46,7 @@ ChannelListRowDMChannel::ChannelListRowDMChannel(const Channel *data) {
             m_icon = Gtk::manage(new Gtk::Image(buf));
         else {
             m_icon = Gtk::manage(new Gtk::Image(Abaddon::Get().GetImageManager().GetPlaceholder(24)));
-            Abaddon::Get().GetImageManager().LoadFromURL(data->Recipients[0].GetAvatarURL("png", "16"), [this](Glib::RefPtr<Gdk::Pixbuf> ldbuf) {
-                Glib::signal_idle().connect([this, ldbuf]() -> bool {
-                    m_icon->property_pixbuf() = ldbuf;
-
-                    return false;
-                });
-            });
+            Abaddon::Get().GetImageManager().LoadFromURL(data->Recipients[0].GetAvatarURL("png", "16"), sigc::mem_fun(*this, &ChannelListRowDMChannel::OnImageLoad));
         }
     }
 
@@ -70,6 +64,11 @@ ChannelListRowDMChannel::ChannelListRowDMChannel(const Channel *data) {
     show_all_children();
 }
 
+void ChannelListRowDMChannel::OnImageLoad(Glib::RefPtr<Gdk::Pixbuf> buf) {
+    if (m_icon != nullptr)
+        m_icon->property_pixbuf() = buf;
+}
+
 ChannelListRowGuild::ChannelListRowGuild(const Guild *data) {
     ID = data->ID;
     m_ev = Gtk::manage(new Gtk::EventBox);

components/channels.hpp

@@ -40,6 +40,8 @@ public:
     ChannelListRowDMChannel(const Channel *data);
 
 protected:
+    void OnImageLoad(Glib::RefPtr<Gdk::Pixbuf> buf);
+
     Gtk::EventBox *m_ev;
     Gtk::Box *m_box;
     Gtk::Label *m_lbl;

components/chatmessage.cpp

@@ -132,6 +132,11 @@ void ChatMessageItemContainer::UpdateAttributes() {
         m_attrib_label->set_markup("<span color='#999999'>[edited]</span>");
 }
 
+bool ChatMessageItemContainer::EmitImageLoad(std::string url) {
+    m_signal_image_load.emit(url);
+    return false;
+}
+
 void ChatMessageItemContainer::AddClickHandler(Gtk::Widget *widget, std::string url) {
     // clang-format off
     widget->signal_button_press_event().connect([url](GdkEventButton *event) -> bool {
@@ -258,27 +263,24 @@ Gtk::EventBox *ChatMessageItemContainer::CreateEmbedComponent(const Message *dat
         }
     }
 
-    bool img = embed.Image.URL.size() > 0;
-    bool thumb = embed.Thumbnail.URL.size() > 0;
-    if (img || thumb) {
+    bool is_img = embed.Image.URL.size() > 0;
+    bool is_thumb = embed.Thumbnail.URL.size() > 0;
+    if (is_img || is_thumb) {
         auto *img = Gtk::manage(new Gtk::Image);
         img->set_halign(Gtk::ALIGN_CENTER);
         int w, h;
-        if (img)
+        if (is_img)
             std::tie(w, h) = GetImageDimensions(embed.Image.Width, embed.Image.Height, 200, 150);
         else
             std::tie(w, h) = GetImageDimensions(embed.Thumbnail.Width, embed.Thumbnail.Height, 200, 150);
         img->set_size_request(w, h);
         main->pack_start(*img);
         m_embed_img = img;
-        if (img)
+        if (is_img)
             m_embed_imgurl = embed.Image.ProxyURL;
         else
             m_embed_imgurl = embed.Thumbnail.ProxyURL;
-        Glib::signal_idle().connect([this]() -> bool {
-            m_signal_image_load.emit(m_embed_imgurl);
-            return false;
-        });
+        Glib::signal_idle().connect(sigc::bind(sigc::mem_fun(*this, &ChatMessageItemContainer::EmitImageLoad), m_embed_imgurl));
     }
 
     if (embed.Footer.Text.length() > 0) {
@@ -366,10 +368,8 @@ std::pair<int, int> ChatMessageItemContainer::GetImageDimensions(int width, int
 
 void ChatMessageItemContainer::HandleImage(const AttachmentData &data, Gtk::Image *img, std::string url) {
     m_img_loadmap[url] = std::make_pair(img, data);
-    Glib::signal_idle().connect([this, url]() -> bool {
-        m_signal_image_load.emit(url); // ask the chatwindow to call UpdateImage because dealing with lifetimes sucks
-        return false;
-    });
+    // ask the chatwindow to call UpdateImage because dealing with lifetimes sucks
+    Glib::signal_idle().connect(sigc::bind(sigc::mem_fun(*this, &ChatMessageItemContainer::EmitImageLoad), url));
 }
 
 void ChatMessageItemContainer::ShowMenu(GdkEvent *event) {

components/chatmessage.hpp

@@ -16,6 +16,8 @@ public:
     void UpdateImage();
 
 protected:
+    bool EmitImageLoad(std::string url);
+
     void AddClickHandler(Gtk::Widget *widget, std::string);
     Gtk::TextView *CreateTextComponent(const Message *data);  // Message.Content
     Gtk::EventBox *CreateEmbedComponent(const Message *data); // Message.Embeds[0]

components/chatwindow.cpp

@@ -232,9 +232,8 @@ void ChatWindow::ProcessNewMessage(Snowflake id, bool prepend) {
 }
 
 void ChatWindow::SetMessagesInternal() {
-    m_update_mutex.lock();
+    std::scoped_lock<std::mutex> guard(m_update_mutex);
     const auto *msgs = &m_set_messages_queue.front();
-    m_update_mutex.unlock();
 
     // empty the listbox
     auto children = m_list->get_children();
@@ -251,9 +250,7 @@ void ChatWindow::SetMessagesInternal() {
         ProcessNewMessage(id, false);
     }
 
-    m_update_mutex.lock();
     m_set_messages_queue.pop();
-    m_update_mutex.unlock();
 }
 
 void ChatWindow::AddNewMessageInternal() {