Replace boost::optional with std::optional (#4877)

src/widgets/dialogs/BadgePickerDialog.hpp

@@ -2,11 +2,11 @@
 
 #include "util/DisplayBadge.hpp"
 
-#include <boost/optional.hpp>
 #include <QComboBox>
 #include <QDialog>
 
 #include <memory>
+#include <optional>
 
 namespace chatterino {
 
@@ -14,7 +14,7 @@ class BadgePickerDialog : public QDialog,
                           public std::enable_shared_from_this<BadgePickerDialog>
 {
     using QIconPtr = std::shared_ptr<QIcon>;
-    using BadgeOpt = boost::optional<DisplayBadge>;
+    using BadgeOpt = std::optional<DisplayBadge>;
 
 public:
     BadgePickerDialog(QList<DisplayBadge> badges, QWidget *parent = nullptr);

src/widgets/dialogs/IrcConnectionEditor.hpp

@@ -3,9 +3,10 @@
 #include "providers/irc/Irc2.hpp"
 #include "widgets/BaseWindow.hpp"
 
-#include <boost/optional.hpp>
 #include <QDialog>
 
+#include <optional>
+
 namespace Ui {
 class IrcConnectionEditor;
 }

src/widgets/dialogs/ReplyThreadPopup.cpp

@@ -239,7 +239,7 @@ void ReplyThreadPopup::addMessagesFromThread()
     this->ui_.threadView->setSourceChannel(sourceChannel);
 
     auto overrideFlags =
-        boost::optional<MessageFlags>(this->thread_->root()->flags);
+        std::optional<MessageFlags>(this->thread_->root()->flags);
     overrideFlags->set(MessageFlag::DoNotLog);
 
     this->virtualChannel_->addMessage(this->thread_->root(), overrideFlags);
@@ -247,7 +247,7 @@ void ReplyThreadPopup::addMessagesFromThread()
     {
         if (auto msg = msgRef.lock())
         {
-            auto overrideFlags = boost::optional<MessageFlags>(msg->flags);
+            auto overrideFlags = std::optional<MessageFlags>(msg->flags);
             overrideFlags->set(MessageFlag::DoNotLog);
 
             this->virtualChannel_->addMessage(msg, overrideFlags);
@@ -261,7 +261,7 @@ void ReplyThreadPopup::addMessagesFromThread()
                 if (message->replyThread == this->thread_)
                 {
                     auto overrideFlags =
-                        boost::optional<MessageFlags>(message->flags);
+                        std::optional<MessageFlags>(message->flags);
                     overrideFlags->set(MessageFlag::DoNotLog);
 
                     // same reply thread, add message

src/widgets/dialogs/UserInfoPopup.cpp

@@ -110,7 +110,7 @@ namespace {
         {
             MessagePtr message = snapshot[i];
 
-            auto overrideFlags = boost::optional<MessageFlags>(message->flags);
+            auto overrideFlags = std::optional<MessageFlags>(message->flags);
             overrideFlags->set(MessageFlag::DoNotLog);
 
             if (checkMessageUserName(userName, message))