Ref T2009. Currently, the code which draws the reticle is sort of implicitly hard-coded with some of the rules for the 2up view.

Instead, use general rules:

• Start selection at the next <td />.
• End selection at the rightmost adjacent <td />.

These rules work in all cases.

• Activated reticle in 1up and 2up views by clicking line numbers and hovering over comments. It now draws correctly.
• Dragged over line ranges in 1up and 2up views, saw accurate reticle.