Add (invisible) resize handle to frameless usercards and reply threads (#4795)

* feat: add resize handle to usercards&reply threads

* Add changelog entry

---------

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/dialogs/UserInfoPopup.cpp

@@ -26,6 +26,7 @@
 #include "util/StreamerMode.hpp"
 #include "widgets/helper/ChannelView.hpp"
 #include "widgets/helper/EffectLabel.hpp"
+#include "widgets/helper/InvisibleSizeGrip.hpp"
 #include "widgets/helper/Line.hpp"
 #include "widgets/Label.hpp"
 #include "widgets/Scrollbar.hpp"
@@ -246,8 +247,10 @@ UserInfoPopup::UserInfoPopup(bool closeAutomatically, QWidget *parent,
     this->shortcuts_ = getApp()->hotkeys->shortcutsForCategory(
         HotkeyCategory::PopupWindow, actions, this);
 
-    auto layout = LayoutCreator<QWidget>(this->getLayoutContainer())
-                      .setLayoutType<QVBoxLayout>();
+    auto layers = LayoutCreator<QWidget>(this->getLayoutContainer())
+                      .setLayoutType<QGridLayout>()
+                      .withoutMargin();
+    auto layout = layers.emplace<QVBoxLayout>();
 
     // first line
     auto head = layout.emplace<QHBoxLayout>().withoutMargin();
@@ -552,6 +555,13 @@ UserInfoPopup::UserInfoPopup(bool closeAutomatically, QWidget *parent,
         logs->setAlignment(this->ui_.noMessagesLabel, Qt::AlignHCenter);
     }
 
+    // size grip
+    if (closeAutomatically)
+    {
+        layers->addWidget(new InvisibleSizeGrip(this), 0, 0,
+                          Qt::AlignRight | Qt::AlignBottom);
+    }
+
     this->installEvents();
     this->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Policy::Ignored);
 }