Userland+LibGUI: Add shorthand versions of the Margins constructor

This allows for typing [8] instead of [8, 8, 8, 8] to specify the same
margin on all edges, for example. The constructors follow CSS' style of
specifying margins. The added constructors are:

- Margins(int all): Sets the same margin on all edges.
- Margins(int vertical, int horizontal): Sets the first argument to top
  and bottom margins, and the second argument to left and right margins.
- Margins(int top, int vertical, int bottom): Sets the first argument to
  the top margin, the second argument to the left and right margins,
  and the third argument to the bottom margin.

1 files changed, 1 insertions, 1 deletions

diff --git a/Base/res/devel/templates/serenity-application/main.cpp b/Base/res/devel/templates/serenity-application/main.cpp
index d3e728bc71..bcb7bb1669 100644
--- a/Base/res/devel/templates/serenity-application/main.cpp
+++ b/Base/res/devel/templates/serenity-application/main.cpp
@@ -28,7 +28,7 @@ int main(int argc, char** argv)
     main_widget.set_fill_with_background_color(true);
 
     auto& layout = main_widget.set_layout<GUI::VerticalBoxLayout>();
-    layout.set_margins({ 16, 16, 16, 16 });
+    layout.set_margins(16);
 
     auto& button = main_widget.add<GUI::Button>("Click me!");
     button.on_click = [&](auto) {