Hotkeys to search on the current line

[ProgerXP]

This is like f F t T in Vim.

Hotkeys except F1 should be currently available. Unbind F1 from About.

Shift/Alt/F1, Shift/Alt+F2 pressed when the text area is focused move focus to an invisible text input. If the document is empty, they do nothing (as Alt+F and others).

1. When a key was pressed while this input is focused and the input's new value is not empty, perform the operation (typically user would input a single symbol, but it's possible to enter an arbitrary string with the usual Alt+V hotkey even though the caret is not visible on screen).
2. When a hotkey (Shift/Alt/F1, Shift/Alt+F2) was pressed while this input is focused, if its current value is empty then do nothing (retain focus there), else perform the operation. This way, because input value is retained for the lifetime of the process, pressing the hotkey twice invokes operation using the previously entered search text.

Operation depends on the hotkey that was pressed either when entering this mode if anything was input (1), or hotkey pressed when leaving it without inputting (2, in this case the first hotkey pressed to focus the input is irrelevant). All operations perform the case-sensitive search for the entered string on the current line; hotkeys differ in the search direction used and positioning of caret and selection. In case no match was found, the operation ends without changing anything.

Hotkey	Direction	Caret	Selection
F1	Forward	Before match	Empty
Shift+F1	Backward	Before match	Empty
Alt+F1	Forward	After match	Empty
Shift+Alt+F1	Backward	After match	Empty
Alt+F2	Forward	After match	Match selected
Shift+Alt+F2	Backward	Before match	Match selected

If main window loses focus, this mode ends (focus returns to the text area). Same happens if the document is changed, a dialog is opened or Escape is pressed.