LibWeb: Rename PaintableBox::effective_offset() => offset()

Since this function no longer does any computation, just "offset" seems
like a fine name.

Userland/Libraries/LibWeb/Painting/PaintableBox.cpp

@@ -115,16 +115,16 @@ void PaintableBox::set_content_size(CSSPixelSize size)
     layout_box().did_set_content_size();
 }
 
-CSSPixelPoint PaintableBox::effective_offset() const
+CSSPixelPoint PaintableBox::offset() const
 {
     return m_offset;
 }
 
 CSSPixelRect PaintableBox::compute_absolute_rect() const
 {
-    CSSPixelRect rect { effective_offset(), content_size() };
+    CSSPixelRect rect { offset(), content_size() };
     for (auto const* block = containing_block(); block && block->paintable(); block = block->paintable()->containing_block())
-        rect.translate_by(block->paintable_box()->effective_offset());
+        rect.translate_by(block->paintable_box()->offset());
     return rect;
 }
 

Userland/Libraries/LibWeb/Painting/PaintableBox.h

@@ -36,7 +36,9 @@ public:
     };
 
     CSSPixelRect absolute_rect() const;
-    CSSPixelPoint effective_offset() const;
+
+    // Offset from the top left of the containing block's content edge.
+    [[nodiscard]] CSSPixelPoint offset() const;
 
     CSSPixelPoint scroll_offset() const;
     void set_scroll_offset(CSSPixelPoint);

Userland/Libraries/LibWeb/Painting/SVGPaintable.cpp

@@ -23,9 +23,9 @@ Layout::SVGBox const& SVGPaintable::layout_box() const
 CSSPixelRect SVGPaintable::compute_absolute_rect() const
 {
     if (auto* svg_svg_box = layout_box().first_ancestor_of_type<Layout::SVGSVGBox>()) {
-        CSSPixelRect rect { effective_offset(), content_size() };
+        CSSPixelRect rect { offset(), content_size() };
         for (Layout::Box const* ancestor = svg_svg_box; ancestor && ancestor->paintable(); ancestor = ancestor->paintable()->containing_block())
-            rect.translate_by(ancestor->paintable_box()->effective_offset());
+            rect.translate_by(ancestor->paintable_box()->offset());
         return rect;
     }
     return PaintableBox::compute_absolute_rect();