LibGUI: Fix image preview size in FilePicker for large images

Image preview widget overflow to other widgets in FilePicker dialog when image is larger than 160px.  Also change the ImagePreview widget variable name for align to naming standards.

Libraries/LibGUI/FilePicker.cpp

@@ -248,10 +248,10 @@ FilePicker::FilePicker(Mode mode, const StringView& file_name, const StringView&
     preview_container.set_layout<VerticalBoxLayout>();
     preview_container.layout()->set_margins({ 8, 8, 8, 8 });
 
-    m_preview_image_label = preview_container.add<Image>();
-    m_preview_image_label->set_should_stretch(true);
-    m_preview_image_label->set_size_policy(SizePolicy::Fixed, SizePolicy::Fixed);
-    m_preview_image_label->set_preferred_size(160, 160);
+    m_preview_image = preview_container.add<Image>();
+    m_preview_image->set_should_stretch(true);
+    m_preview_image->set_auto_resize(false);
+    m_preview_image->set_preferred_size(160, 160);
 
     m_preview_name_label = preview_container.add<Label>();
     m_preview_name_label->set_font(Gfx::Font::default_bold_font());
@@ -275,17 +275,17 @@ void FilePicker::set_preview(const LexicalPath& path)
             clear_preview();
             return;
         }
-        bool should_stretch = bitmap->width() > m_preview_image_label->width() || bitmap->height() > m_preview_image_label->height();
+        bool should_stretch = bitmap->width() > m_preview_image->width() || bitmap->height() > m_preview_image->height();
         m_preview_name_label->set_text(path.basename());
         m_preview_geometry_label->set_text(bitmap->size().to_string());
-        m_preview_image_label->set_should_stretch(should_stretch);
-        m_preview_image_label->set_bitmap(move(bitmap));
+        m_preview_image->set_should_stretch(should_stretch);
+        m_preview_image->set_bitmap(move(bitmap));
     }
 }
 
 void FilePicker::clear_preview()
 {
-    m_preview_image_label->set_bitmap(nullptr);
+    m_preview_image->set_bitmap(nullptr);
     m_preview_name_label->set_text(String::empty());
     m_preview_geometry_label->set_text(String::empty());
 }

Libraries/LibGUI/FilePicker.h

@@ -74,7 +74,7 @@ private:
     LexicalPath m_selected_file;
 
     RefPtr<TextBox> m_filename_textbox;
-    RefPtr<Image> m_preview_image_label;
+    RefPtr<Image> m_preview_image;
     RefPtr<Label> m_preview_name_label;
     RefPtr<Label> m_preview_geometry_label;
     Mode m_mode { Mode::Open };