Texture-based nine-patch [StyleBox]. Texture-based nine-patch [StyleBox], in a way similar to [NinePatchRect]. This stylebox performs a 3×3 scaling of a texture, where only the center cell is fully stretched. This makes it possible to design bordered styles regardless of the stylebox's size. Expands the bottom margin of this style box when drawing, causing it to be drawn larger than requested. Expands the left margin of this style box when drawing, causing it to be drawn larger than requested. Expands the right margin of this style box when drawing, causing it to be drawn larger than requested. Expands the top margin of this style box when drawing, causing it to be drawn larger than requested. Increases the bottom margin of the 3×3 texture box. A higher value means more of the source texture is considered to be part of the bottom border of the 3×3 box. This is also the value used as fallback for [member StyleBox.content_margin_bottom] if it is negative. Increases the left margin of the 3×3 texture box. A higher value means more of the source texture is considered to be part of the left border of the 3×3 box. This is also the value used as fallback for [member StyleBox.content_margin_left] if it is negative. Increases the right margin of the 3×3 texture box. A higher value means more of the source texture is considered to be part of the right border of the 3×3 box. This is also the value used as fallback for [member StyleBox.content_margin_right] if it is negative. Increases the top margin of the 3×3 texture box. A higher value means more of the source texture is considered to be part of the top border of the 3×3 box. This is also the value used as fallback for [member StyleBox.content_margin_top] if it is negative. Modulates the color of the texture when this style box is drawn. The normal map to use when drawing this style box. Species a sub region of the texture to use. This is equivalent to first wrapping the texture in an [AtlasTexture] with the same region. The texture to use when drawing this style box.