[Bug] Indent area as non-tab area

[mister-goo]

Abstract

I'm using an extension to undo closed tabs by clicking on the non-tab area. However, the indent space before each tab doesn't count as non-tab area, so I can only undo a closed tab by clicking the scrollbar or the space below the tabs. In an old version of TST (3.4.8), the indent space is counted as non-tab area.

Steps to reproduce

1. Install TST and tst-middleclick.
2. Middle-click on the indent space before tabs.

A
 \- B (click on the space before the tab)

Expected result

Clicking on the indent space generates a non-tab area click event.

Actual result

Doesn't work in 4.1.3; works in 3.4.8. Is it possible to restore the old behavior? Thanks.