fix some crashes, mostly related to network requests (#6187)

src/widgets/helper/NotebookButton.cpp

@@ -1,5 +1,6 @@
 #include "widgets/helper/NotebookButton.hpp"
 
+#include "Application.hpp"
 #include "common/QLogging.hpp"
 #include "singletons/Theme.hpp"
 #include "widgets/helper/Button.hpp"
@@ -213,11 +214,21 @@ void NotebookButton::dropEvent(QDropEvent *event)
 
 void NotebookButton::hideEvent(QHideEvent *)
 {
+    if (isAppAboutToQuit())
+    {
+        return;
+    }
+
     this->parent_->refresh();
 }
 
 void NotebookButton::showEvent(QShowEvent *)
 {
+    if (isAppAboutToQuit())
+    {
+        return;
+    }
+
     this->parent_->refresh();
 }
 

src/widgets/splits/SplitHeader.cpp

@@ -848,6 +848,8 @@ void SplitHeader::updateChannelText()
                 NetworkRequest(url, NetworkRequestType::Get)
                     .caller(this)
                     .onSuccess([this](auto result) {
+                        assert(!isAppAboutToQuit());
+
                         // NOTE: We do not follow the redirects, so we need to make sure we only treat code 200 as a valid image
                         if (result.status() == 200)
                         {