ZMJGanttChart 当column 的宽度不一样时 merge后的宽度计算不准 问题处理

修改源码 "ZMJLayoutEngine.h" 文件

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        ZMJCellRange *mergedCell = [self.spreadsheetView mergedCellFor:[Location locationWithRow:row column:column]];
        if (mergedCell) {
            CGFloat cellWidth  = 0;
            CGFloat cellHeight = 0;
            if (!CGSizeEqualToSize(CGSizeZero, mergedCell.size)) {
                cellWidth  = mergedCell.size.width;
                cellHeight = mergedCell.size.height;
            } else {
                for (NSInteger col = mergedCell.from.column; col <= mergedCell.to.column; ++col) {
                    cellWidth += self.columnWidthCache[col].floatValue + self.intercellSpacing.width;
                }
                for (NSInteger r = mergedCell.from.row; r <= mergedCell.to.row; ++r) {
                    cellHeight += self.rowHeightCache[r].floatValue + self.intercellSpacing.height;
                }
                mergedCell.size = CGSizeMake(cellWidth, cellHeight);
            }