With SHIFT/TAB selecting extra lines on script edit on reduce indent

[canny]

1. Create a default new script.
2. Select the state_entry() line by placing the cursor at the very beginning of line 2, then press shift- down arrow to select to the beginning of line 3.
3. Press shift-tab a few times.

Observed: Further shift-tabbing will keep growing the selection and unindenting the wrong lines: the longer the selection, the more the selection keeps growing.

https://secondlife.canny.io/admin/board/bug-reports/p/with-shift-tab-selecting-extra-lines-on-script-edit-on-reduce-indent

[canny]

This issue has been linked to a Canny post: With SHIFT/TAB selecting extra lines on script edit on reduce indent 🎉

[LLGuru]

• Fixed by #3096 Shift+Tab selects extra lines on script edit on reduce indent #3154