Topic data grid does not follow window width changes

[kinghuang]

When viewing a topic data in grid view, the grid does not resize horizontally to follow window size changes. For example, if the window is resized larger, the right side of the grid still ends at where the window's original size was. If the grid is scrolled horizontally, only the grid headers expands to fill the extra space. The grid body still ends with the window's original size.

Here's some example screenshots.

Original window

Window resized larger horizontally

Scrolling the grid to the right