Horizontal scrolling with multiple tables scrolls headers on all tables

[SiddharthMantri]

As stated, if there are multiple tables on one page, horizontally scrolling any one table will scroll the headers on all visible tables.

To test, open demos/perf.html. Resize the columns on the first table such that one of the column overflows to the right. This enables the horizontal scroll bar. Using this to scroll, you can scroll across the headers on all tables.

Step 1: Normal table with resized columns. The second table does not resize as expected.

Step 2: Scrolling the horizontal scroll, also scrolls the second table.