LUA: Add flat flag for the WidgetOptions in Gui bindings

Change-Id: I4aab77c8c0289734a50eb86b14c8aa01b6e64fa8
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/libs/utils/layoutbuilder.cpp

@@ -887,6 +887,11 @@ void PushButton::setIconPath(const Utils::FilePath &iconPath)
     access(this)->setIcon(icon.icon());
 }
 
+void PushButton::setFlat(bool flat)
+{
+    access(this)->setFlat(flat);
+}
+
 void PushButton::onClicked(const std::function<void ()> &func, QObject *guard)
 {
     QObject::connect(access(this), &QAbstractButton::clicked, guard, func);

src/libs/utils/layoutbuilder.h

@@ -291,6 +291,7 @@ public:
 
     void setText(const QString &);
     void setIconPath(const Utils::FilePath &);
+    void setFlat(bool);
     void onClicked(const std::function<void()> &, QObject *guard);
 };
 

src/plugins/lua/bindings/gui.cpp

@@ -101,9 +101,16 @@ HAS_MEM_FUNC(setWindowFlags, hasSetWindowFlags);
 HAS_MEM_FUNC(setWidgetAttribute, hasSetWidgetAttribute);
 HAS_MEM_FUNC(setAutoFillBackground, hasSetAutoFillBackground);
 HAS_MEM_FUNC(setIconPath, hasSetIconPath);
+HAS_MEM_FUNC(setFlat, hasSetFlat);
 
 template<class T>
 void setProperties(std::unique_ptr<T> &item, const sol::table &children, QObject *guard) {
+    if constexpr (hasSetFlat<T, void (T::*)(bool)>::value) {
+        const auto flat = children.get<sol::optional<bool>>("flat");
+        if (flat)
+            item->setFlat(*flat);
+    }
+
     if constexpr (hasSetIconPath<T, void (T::*)(const Utils::FilePath &)>::value) {
         const auto iconPath = children.get<sol::optional<Utils::FilePath>>("iconPath");
         if (iconPath)

src/plugins/lua/meta/gui.lua

@@ -33,6 +33,7 @@ gui.baseWidgetOptions = {}
 ---@field iconPath? FilePath The path to the icon of the widget, if applicable. Empty or not existent paths set null icon. (see [QIcon](https://doc.qt.io/qt-5/qicon.html#QIcon))
 ---@field text? string The text of the widget, if applicable.
 ---@field value? integer The value of the widget, if applicable.
+---@field flat? boolean A boolean, representing whether the widget should be flat, if applicable.
 ---@field [1]? Layout The layout of the widget, if applicable.
 gui.widgetOptions = {}