Disable use of Qt APIs deprecated in 5.15.0 and earlier versions (#4133)

src/widgets/dialogs/EmotePopup.cpp

@@ -167,11 +167,11 @@ EmotePopup::EmotePopup(QWidget *parent)
     QRegularExpression searchRegex("\\S*");
     searchRegex.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
 
-    layout->setMargin(0);
+    layout->setContentsMargins(0, 0, 0, 0);
     layout->setSpacing(0);
 
     QHBoxLayout *layout2 = new QHBoxLayout(this);
-    layout2->setMargin(8);
+    layout2->setContentsMargins(8, 8, 8, 8);
     layout2->setSpacing(8);
 
     this->search_ = new QLineEdit();
@@ -214,7 +214,7 @@ EmotePopup::EmotePopup(QWidget *parent)
 
     this->notebook_ = new Notebook(this);
     layout->addWidget(this->notebook_);
-    layout->setMargin(0);
+    layout->setContentsMargins(0, 0, 0, 0);
 
     this->subEmotesView_ = makeView("Subs");
     this->channelEmotesView_ = makeView("Channel");

src/widgets/dialogs/NotificationPopup.cpp

@@ -32,8 +32,7 @@ void NotificationPopup::updatePosition()
 {
     Location location = BottomRight;
 
-    QDesktopWidget *desktop = QApplication::desktop();
-    const QRect rect = desktop->availableGeometry();
+    const QRect rect = QGuiApplication::primaryScreen()->availableGeometry();
 
     switch (location)
     {

src/widgets/dialogs/ReplyThreadPopup.cpp

@@ -90,7 +90,8 @@ ReplyThreadPopup::ReplyThreadPopup(bool closeAutomatically, QWidget *parent,
 
     layout->setSpacing(0);
     // provide draggable margin if frameless
-    layout->setMargin(closeAutomatically ? 15 : 1);
+    auto marginPx = closeAutomatically ? 15 : 1;
+    layout->setContentsMargins(marginPx, marginPx, marginPx, marginPx);
     layout->addWidget(this->ui_.threadView, 1);
     layout->addWidget(this->ui_.replyInput);
 }

src/widgets/dialogs/SettingsDialog.cpp

@@ -123,7 +123,7 @@ void SettingsDialog::initUi()
         .assign(&this->ui_.pageStack)
         .withoutMargin();
 
-    this->ui_.pageStack->setMargin(0);
+    this->ui_.pageStack->setContentsMargins(0, 0, 0, 0);
 
     outerBox->addSpacing(12);
 
@@ -193,9 +193,7 @@ void SettingsDialog::filterElements(const QString &text)
 
 void SettingsDialog::addTabs()
 {
-    this->ui_.tabContainer->setMargin(0);
     this->ui_.tabContainer->setSpacing(0);
-
     this->ui_.tabContainer->setContentsMargins(0, 20, 0, 20);
 
     // Constructors are wrapped in std::function to remove some strain from first time loading.