UI: Add vertical scroll area subclass

The regular scroll area can expand horizontally, but the problem with
this is that sometimes there are controls within it that expand way too
big.

For example, the properties window for window capture can have a list of
windows where the titles of the windows are really really long, and it
causes the properties to extend way too far to the right, making the
window look really unusual.

Another example are the volume controls in the main window that can
expand way to the right if the name of a source is really long, causing
the volume control to stretch way too far to the right, making the
volume controls difficult to use when that happens.

So this just makes it so it sets the maximum width of a scroll area's
internal widget to the actual width of the scroll area, preventing it
from going off the side of the scroll area.

obs/CMakeLists.txt

@@ -105,6 +105,7 @@ set(obs_SOURCES
 	properties-view.cpp
 	volume-control.cpp
 	adv-audio-control.cpp
+	vertical-scroll-area.cpp
 	crash-report.cpp
 	qt-wrappers.cpp)
 
@@ -129,6 +130,7 @@ set(obs_HEADERS
 	display-helpers.hpp
 	volume-control.hpp
 	adv-audio-control.hpp
+	vertical-scroll-area.hpp
 	qt-display.hpp
 	crash-report.hpp
 	qt-wrappers.hpp)

obs/vertical-scroll-area.cpp

@@ -0,0 +1,8 @@
+#include <QResizeEvent>
+#include "vertical-scroll-area.hpp"
+
+void VScrollArea::resizeEvent(QResizeEvent *event)
+{
+	if (!!widget())
+		widget()->setMaximumWidth(event->size().width());
+}

obs/vertical-scroll-area.hpp

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <QScrollArea>
+
+class QResizeEvent;
+
+class VScrollArea : public QScrollArea {
+	Q_OBJECT
+
+public:
+	inline VScrollArea(QWidget *parent = nullptr)
+		: QScrollArea(parent)
+	{
+	}
+
+protected:
+	virtual void resizeEvent(QResizeEvent *event) override;
+};