Rectangular selection is broken with elastic tab stops.
I started with some html. The buffer settings are html edit mode, no word wrap, tab width 3, indent width 3, soft tabs are off, elastic tab stops are on.
Then I did regex search and replace.
Search for: </td><td
Replace with: </td>\t<td
I wanted to insert additional style in the "Example" column, so I put the caret between 'style="' and 'color' on the second line, then CS+click in the same place on the last line. I get this:
Not so good. I tried in the second column, with similar results. Rectangular selection works in the first column, that is, before the first tab.
Just for fun, I typed an "x". That's really bad.