$ ag "xsize == 0" src/terraform_gui.cpp 
99:     if (this->xsize == 0 && this->ysize == 0) { // 'dot' mode.
111:    FinderData fdata(CS_GROUND, (this->xsize == 0 && this->ysize == 0) ? FW_CORNER : FW_TILE);
132:    if (this->xsize == 0 && this->ysize == 0) {
223:    if (this->xsize == 0 && this->ysize == 0) {
237:    if (this->xsize == 0 && this->ysize == 0) {