On Android TV the mpv.conf editor used Plezy's own on-screen keyboard
instead of Gboard, and the only way to get a long conf onto a TV was to
retype it key by key (#2232). The system keyboards cannot host the
multiline editor: FireTVIME has no newline key, and both FireTVIME and
Gboard could wipe a pre-filled multiline field on the first keystroke
after the first-show restartInput.
On TV, render one single-line native field per line, with a line-number
gutter, a remove button per row and an Add line button. Rows open their
keyboard on Select only, so D-pad traversal does not raise it. A value
arriving with newlines (a paste from a phone remote) is split into rows
and typing continues on the last one; the rows are keyed so the split
does not rebind another row's input host. The keyboard's action key does
not insert a row: the app never learns which action the IME sent, and
FireTVIME reports Back as `previous`, so an insert-on-action editor kept
opening rows on every Back. Completion hands focus down instead — the
next row, or Add line after the last one.
TvTextInputController gains focusAndOpenTextInput() so a row the app
creates (Add line, paste split) can be typed into without a second
Select; it activates after the focus request lands, since the host's
focus sync deactivates an unfocused field.
Verified on a Google TV box (Gboard, Android 14) and a Fire TV Stick
(FireTVIME): rows keep their text on open, Back closes the keyboard
without side effects, edits persist across leaving the screen. Phone,
desktop and pointer platforms keep the text-area editor.
close#2232
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