A terminal drawn by the application itself needed four things ltk did not give it: the selection the middle button pastes, a way to read the clipboard, the text a key types once dead keys are applied, and a text cursor over its text area that does not hide the window's resize cursors. Text fields gain the primary selection along the way, and the symbol fallback and a missed field in the previous commit are fixed.
The primary selection. `event_loop/primary_selection.rs` binds `zwp_primary_selection_device_manager_v1` when the compositor offers it, creates the device with the data device in `new_seat`, and holds the manager, the device, our source while we own the selection, its text and the inbox the reader threads post to. A selection offered by another client is read on a thread of its own as the clipboard is; a peer asking for ours is served from the cached text, and a cancelled source is dropped. `data_device.rs` gives both the pieces they share: `pick_text_mime`, `read_selection` and `write_selection`, so the clipboard behaves as before.
Text fields. Once a press ends, `sync_text_field` publishes a new selection in the focused text field as the primary selection; password fields never publish theirs. It remembers what it last published rather than comparing with the current primary selection, so a selection made in another application is not taken back. A middle-button press on a text field focuses it, puts the cursor where it landed and inserts the primary selection there.
The application's side. `App::take_primary_request` makes a text the primary selection, as `take_clipboard_request` does for the clipboard. `App::take_paste_request` names a `SelectionKind`, `Clipboard` or `Primary`, and the runtime answers with `App::on_paste` and that selection's text, never with an empty one. `App::on_pointer_middle` reports a middle-button press anywhere but on a text field. All default to doing nothing.
Raw keys. `App::on_raw_key_with_alt` gives way to `App::on_raw_key_event`, which takes a `RawKey` with the keysym, the keycode, the press, Ctrl, Shift and Alt, and `text`: what sctk reports the key types once dead keys and compose sequences are applied, `None` on release, halfway through a sequence and for keys that type nothing. A terminal that took the character from the keysym typed `a` for an acute accent followed by `a`. The default still forwards to `on_raw_key`, and prompt was the only application overriding the old hook. Every key press now also records its serial in `last_input_serial`, so a selection set from a keyboard shortcut carries a serial a strict compositor accepts rather than the last click's.
The cursor. `App::cursor_at( x, y )` is the cursor the application wants at a point of the main surface. It comes after the resize edges and `cursor_override`, and before the cursor of the widget under the pointer, so a terminal shows the text cursor over its cells and the resize cursors still show at the window's edges, which a `cursor_override` would hide.
Fonts. Noto Sans Symbols 2 and Noto Sans Symbols follow DejaVu Sans in the fallback chain, for the media controls, arrows and shapes DejaVu lacks, which drew as the missing glyph.
`TextEdit::map_msg` now carries `pad_h` over: the previous commit added the field but left it out there, and ltk did not build.
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