Two issues with the editing UI:
Clearing a keyword/priority did nothing. The "None" menu items write an
empty value to the field, which the client sends as an OTRUNC open plus a
zero-length Twrite. But the server flushed the virtfs write handler on
clunk only when the write buffer was non-empty, so the empty write — the
whole point of a clear — was dropped and the field kept its old value.
Flush on clunk whenever the fid was opened for writing (non-rdwr), not
just when bytes were buffered, so an empty write clears the field.
Verified live: an empty stdin write to /<doc>/<id>/keyword and /priority
now removes the keyword and priority from the headline.
Drag-to-refile fought the ListView. The grip's DragHandler and the
enclosing Flickable both wanted the press, so dragging usually scrolled
instead of moving the section. Gate the drag behind a press-and-hold: a
left-gutter grip (⠿ in a rounded cell) arms on a 0.35s long press
(TapHandler.onLongPressed), and the DragHandler is enabled only while
armed. A quick press-drag now scrolls the list; a hold then drag performs
the structural move. The grip highlights while armed/dragging and shows
an open-hand/size-all cursor.
GUI builds clean; server builds clean.
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