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

src/widgets/splits/Split.cpp

@@ -96,7 +96,7 @@ Split::Split(QWidget *parent)
     this->setFocusProxy(this->input_->ui_.textEdit);
 
     this->vbox_->setSpacing(0);
-    this->vbox_->setMargin(1);
+    this->vbox_->setContentsMargins(1, 1, 1, 1);
 
     this->vbox_->addWidget(this->header_);
     this->vbox_->addWidget(this->view_, 1);

src/widgets/splits/SplitHeader.cpp

@@ -330,7 +330,7 @@ void SplitHeader::initializeLayout()
         },
         this->managedConnections_);
 
-    layout->setMargin(0);
+    layout->setContentsMargins(0, 0, 0, 0);
     layout->setSpacing(0);
     this->setLayout(layout);
 

src/widgets/splits/SplitInput.cpp

@@ -209,9 +209,8 @@ void SplitInput::themeChangedEvent()
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 12, 0))
     this->ui_.textEdit->setPalette(placeholderPalette);
 #endif
-
-    this->ui_.vbox->setMargin(
-        int((this->theme->isLightTheme() ? 4 : 2) * this->scale()));
+    auto marginPx = (this->theme->isLightTheme() ? 4 : 2) * this->scale();
+    this->ui_.vbox->setContentsMargins(marginPx, marginPx, marginPx, marginPx);
 
     this->ui_.emoteButton->getLabel().setStyleSheet("color: #000");
 

src/widgets/splits/SplitOverlay.cpp

@@ -22,7 +22,7 @@ SplitOverlay::SplitOverlay(Split *parent)
 {
     QGridLayout *layout = new QGridLayout(this);
     this->layout_ = layout;
-    layout->setMargin(1);
+    layout->setContentsMargins(1, 1, 1, 1);
     layout->setSpacing(1);
 
     layout->setRowStretch(1, 1);