问题
When scrolling horizontally mat-table, row does not expand to the end of column, just columns that are present on the screen. Because of that, when horizontal scrolling to the right, when mat-row goes out of screen, left sticky columns also leaves (see black border that are present on bottom of mat-row).
Url example link: https://stackblitz.com/edit/angular-ddqxvn
Is it possible to expand mat-row to all columns (even does that are out of screen), which will keep sticky columns on the left. I am looking for answer with mat-table as element, and not table with 'mat-table' attribute. Does anyone know how to do this?
来源：https://stackoverflow.com/questions/61195686/left-sticky-columns-disappear-when-scrolling-horizontally-mat-table-with-too-man