What's with the Old Strings Fix?

Upon doing File->New, the Tools->Fix Tools->Old Strings Fix is greyed out. There is no ? button next to it.

What must I do to enable it?

I found onStrFix() in zquest.cpp, which has these clues:

Quote:

---

Fix: Old Margins
Fixing margins may cause strings that used to spill outside the textbox to instead be cut off. Are you sure?

Fix: Old Frame Size
This will fix the frame size of all strings. No visual changes should occur as the string width/height will be fixed, but the compat QR will also be unchecked.

---

That menu option is disabled by:

Code:

---

                fixtools_menu.disable_uid(MENUID_FIXTOOL_OLDSTRING,
                        !(get_qr(qr_OLD_STRING_EDITOR_MARGINS)
                                ||get_qr(qr_STRING_FRAME_OLD_WIDTH_HEIGHT)));

---

in zquest.cpp