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* clutter/cogl/gl/cogl-texture.c (_cogl_texture_upload_subregion_to_gl) (_cogl_texture_upload_to_gl): * clutter/cogl/gles/cogl-texture.c (_cogl_texture_upload_to_gl) (_cogl_texture_upload_subregion_to_gl): When uploading data to a sliced texture, fill the waste pixels with copies of the edge of the real texture data. Otherwise the value of the waste pixels are undefined so it will show artifacts when the texture is scaled with GL_LINEAR and the pixels are blended in.