Save Find Text (Alt+F3) to refresh match indication

[ProgerXP]

When #321 is triggered, behave as if a search was performed but next result wasn't selected/scrolled to. In other words, upon Alt+F3 redraw #388 according to the just-saved find text. The behaviour is identical to user moving caret to just before the saved text and pressing F3. This allows to quickly check if the current occurrence is first/last/only in the document.