UI: Add "Show" button to password text properties

Allows the user to be able to optionally toggle the password text if
they wish.  Mostly useful for troubleshooting purposes.

obs/data/locale/en-US.ini

@@ -37,6 +37,7 @@ SceneProjector="Fullscreen Projector (Scene)"
 SourceProjector="Fullscreen Projector (Source)"
 Clear="Clear"
 Revert="Revert"
+Show="Show"
 
 # "name already exists" dialog box
 NameExists.Title="Name already exists"

obs/properties-view.cpp

@@ -184,7 +184,8 @@ QWidget *OBSPropertiesView::AddCheckbox(obs_property_t *prop)
 	return NewWidget(prop, checkbox, SIGNAL(stateChanged(int)));
 }
 
-QWidget *OBSPropertiesView::AddText(obs_property_t *prop)
+QWidget *OBSPropertiesView::AddText(obs_property_t *prop, QFormLayout *layout,
+		QLabel *&label)
 {
 	const char    *name = obs_property_name(prop);
 	const char    *val  = obs_data_get_string(settings, name);
@@ -193,13 +194,32 @@ QWidget *OBSPropertiesView::AddText(obs_property_t *prop)
 	if (type == OBS_TEXT_MULTILINE) {
 		QPlainTextEdit *edit = new QPlainTextEdit(QT_UTF8(val));
 		return NewWidget(prop, edit, SIGNAL(textChanged()));
-	}
 
-	QLineEdit *edit = new QLineEdit();
+	} else if (type == OBS_TEXT_PASSWORD) {
+		QLayout *subLayout = new QHBoxLayout();
+		QLineEdit *edit = new QLineEdit();
+		QPushButton *show = new QPushButton();
 
-	if (type == OBS_TEXT_PASSWORD)
+		show->setText(QTStr("Show"));
+		show->setCheckable(true);
+		edit->setText(QT_UTF8(val));
 		edit->setEchoMode(QLineEdit::Password);
 
+		subLayout->addWidget(edit);
+		subLayout->addWidget(show);
+
+		WidgetInfo *info = new WidgetInfo(this, prop, edit);
+		connect(show, &QAbstractButton::toggled,
+				info, &WidgetInfo::TogglePasswordText);
+		children.emplace_back(info);
+
+		label = new QLabel(QT_UTF8(obs_property_description(prop)));
+		layout->addRow(label, subLayout);
+		return nullptr;
+	}
+
+	QLineEdit *edit = new QLineEdit();
+
 	edit->setText(QT_UTF8(val));
 
 	return NewWidget(prop, edit, SIGNAL(textEdited(const QString &)));
@@ -571,7 +591,7 @@ void OBSPropertiesView::AddProperty(obs_property_t *property,
 		AddFloat(property, layout, &label);
 		break;
 	case OBS_PROPERTY_TEXT:
-		widget = AddText(property);
+		widget = AddText(property, layout, label);
 		break;
 	case OBS_PROPERTY_PATH:
 		AddPath(property, layout, &label);
@@ -794,6 +814,12 @@ void WidgetInfo::ButtonClicked()
 	}
 }
 
+void WidgetInfo::TogglePasswordText(bool show)
+{
+	reinterpret_cast<QLineEdit*>(widget)->setEchoMode(
+			show ? QLineEdit::Normal : QLineEdit::Password);
+}
+
 void WidgetInfo::ControlChanged()
 {
 	const char        *setting = obs_property_name(property);

obs/properties-view.hpp

@@ -18,6 +18,8 @@ typedef void              (*PropertiesUpdateCallback)(void *obj,
 class WidgetInfo : public QObject {
 	Q_OBJECT
 
+	friend class OBSPropertiesView;
+
 private:
 	OBSPropertiesView *view;
 	obs_property_t    *property;
@@ -33,6 +35,8 @@ private:
 	bool FontChanged(const char *setting);
 	void ButtonClicked();
 
+	void TogglePasswordText(bool checked);
+
 public:
 	inline WidgetInfo(OBSPropertiesView *view_, obs_property_t *prop,
 			QWidget *widget_)
@@ -40,6 +44,7 @@ public:
 	{}
 
 public slots:
+
 	void ControlChanged();
 };
 
@@ -72,7 +77,8 @@ private:
 			const char *signal);
 
 	QWidget *AddCheckbox(obs_property_t *prop);
-	QWidget *AddText(obs_property_t *prop);
+	QWidget *AddText(obs_property_t *prop, QFormLayout *layout,
+			QLabel *&label);
 	void AddPath(obs_property_t *prop, QFormLayout *layout, QLabel **label);
 	void AddInt(obs_property_t *prop, QFormLayout *layout, QLabel **label);
 	void AddFloat(obs_property_t *prop, QFormLayout *layout,