Drag links out of slots on the wiresheet; hide @palette=false types

Hovering a slot row highlights the half under the pointer and shows a
direction cursor. Pressing on a slot drags a rubber band; dropping on
another slot links them, dropping on a title bar opens the Link dialog
with the dragged slot preselected, and a no-entry cursor marks a slot
that would refuse the link. A right click that never moves still opens
the context menu.

The palette now leaves out types whose facets carry @palette=false, and
kits with nothing placeable left.

Also points the default device host at 192.168.1.251.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app_state.py

@@ -8,7 +8,7 @@ so later rebinding would only ever be seen by the module that did it.
 import configparser
 import os
 
-VERSION = "0.0.0.138"
+VERSION = "0.0.0.139"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True

editor.properties

@@ -7,7 +7,7 @@ left_pane_width = 230
 trace_dasp = True
 
 [Device]
-host = 192.168.1.29
+host = 192.168.1.251
 port = 1876
 user = admin
 

link_drag.py

@@ -0,0 +1,495 @@
+"""Linking on the wiresheet with the mouse: slot hover, drag-out rubber band, drop.
+
+Hovering a slot row highlights the half of it the pointer is in and swaps the cursor for
+a horizontal arrow: the right half of a row is where a link leaves a slot, so it points
+right, and the left half is where one arrives, so it points left. Pressing either
+button on a slot and dragging pulls a rubber-band line out of that side; letting go on
+another slot makes the link, and letting go on a component's title bar opens the Link
+dialog for the two components with the dragged slot already picked. Started on the right half, the slot under the pointer is
+the target; started on the left half, it is the source -- so a link can be drawn from
+either end. While dragging, the cursor points along the flow of the link over a slot that
+would take it, and turns into a no-entry sign over one that would not, so a bad drop is
+visible before the button is released.
+
+A right press that never moves still opens the component's context menu. A left press
+anywhere on a box selects it, but only a press on its title bar moves it; on a slot row
+it draws a link instead, as in Workbench.
+"""
+
+import os
+import struct
+import tempfile
+import tkinter as tk
+
+import app_state
+import sax_file
+import wiresheet
+from sax_dom import get_component_path
+
+NO_ENTRY_PNG = os.path.join(os.path.dirname(os.path.abspath(__file__)),
+                            "assets", "cursors", "no_entry.png")
+DRAG_THRESHOLD = 4              # pixels the pointer must travel before a press is a drag
+HOVER_COLOR = "#1f4e79"
+DROP_OK_COLOR = "#2e9d3a"
+DROP_BAD_COLOR = "#d62828"
+RUBBER_COLOR = "#2f6fba"
+
+_cursors = {}                   # role -> Tk cursor spec, built on first use
+_press = None                   # pending right press: {"hit", "x", "y", "event"}
+_drag = None                    # live link drag: {"hit", "anchor"}
+_menu_callback = None           # opens the ordinary right-click menu for an event
+_link_dialog = None             # opens the Link dialog: (source, target, src_slot, tgt_slot)
+
+
+# --------------------------------------------------------------------------- cursors
+
+def _write_cur(path, pixels, hotspot):
+    """Writes a 32x32 32-bit Windows .cur from rows of (r, g, b, a) tuples."""
+    size = 32
+    xor = bytearray()
+    for row in reversed(pixels):                     # DIBs are stored bottom-up
+        for r, g, b, a in row:
+            xor += bytes((b, g, r, a))
+    mask = bytearray()
+    for row in reversed(pixels):
+        bits = 0
+        for x, (_, _, _, a) in enumerate(row):
+            if a == 0:
+                bits |= 1 << (31 - x)
+        mask += struct.pack(">I", bits)
+    header = struct.pack("<IiiHHIIiiII", 40, size, size * 2, 1, 32, 0,
+                         len(xor) + len(mask), 0, 0, 0, 0)
+    image = header + bytes(xor) + bytes(mask)
+    icondir = struct.pack("<HHH", 0, 2, 1)
+    entry = struct.pack("<BBBBHHII", size, size, 0, 0, hotspot[0], hotspot[1],
+                        len(image), 6 + 16)
+    with open(path, "wb") as f:
+        f.write(icondir + entry + image)
+
+
+def _inside_polygon(px, py, poly):
+    inside = False
+    j = len(poly) - 1
+    for i in range(len(poly)):
+        xi, yi = poly[i]
+        xj, yj = poly[j]
+        if (yi > py) != (yj > py) and px < (xj - xi) * (py - yi) / (yj - yi) + xi:
+            inside = not inside
+        j = i
+    return inside
+
+
+def _arrow_pixels(pointing_right):
+    """A hollow block arrow: white body, black rim -- the Workbench link cursor."""
+    poly = [(9, 14), (16, 14), (16, 10), (23, 16), (16, 22), (16, 18), (9, 18)]
+    if not pointing_right:
+        poly = [(32 - x, y) for x, y in poly]
+    inside = [[_inside_polygon(x + 0.5, y + 0.5, poly) for x in range(32)]
+              for y in range(32)]
+    rows = []
+    for y in range(32):
+        row = []
+        for x in range(32):
+            if not inside[y][x]:
+                row.append((0, 0, 0, 0))
+                continue
+            rim = any(not (0 <= x + dx < 32 and 0 <= y + dy < 32 and inside[y + dy][x + dx])
+                      for dx in (-1, 0, 1) for dy in (-1, 0, 1))
+            row.append((0, 0, 0, 255) if rim else (255, 255, 255, 255))
+        rows.append(row)
+    return rows
+
+
+def _no_entry_pixels():
+    """assets/cursors/no_entry.png, centred on a 32x32 cursor; None if unreadable.
+
+    Read with PIL when it is installed, which keeps the image's soft edges; otherwise
+    with Tk's own PNG reader, which only knows whether a pixel is transparent or not.
+    """
+    if not os.path.exists(NO_ENTRY_PNG):
+        return None
+    try:
+        from PIL import Image
+        image = Image.open(NO_ENTRY_PNG).convert("RGBA")
+        width, height = image.size
+
+        def pixel(x, y):
+            return image.getpixel((x, y))
+    except ImportError:
+        image = tk.PhotoImage(file=NO_ENTRY_PNG)
+        width, height = image.width(), image.height()
+
+        def pixel(x, y):
+            if image.transparency_get(x, y):
+                return (0, 0, 0, 0)
+            return tuple(image.get(x, y)) + (255,)
+    if width > 32 or height > 32:
+        return None
+    left, top = 16 - width // 2, 16 - height // 2
+    rows = [[(0, 0, 0, 0)] * 32 for _ in range(32)]
+    for y in range(height):
+        for x in range(width):
+            rows[top + y][left + x] = pixel(x, y)
+    return rows
+
+
+def _cursor(role):
+    """The Tk cursor for 'right', 'left' or 'no', drawn once and cached."""
+    if role in _cursors:
+        return _cursors[role]
+    fallback = {"right": "sb_right_arrow", "left": "sb_left_arrow", "no": "X_cursor"}[role]
+    spec = fallback
+    if os.name == "nt":
+        try:
+            folder = os.path.join(tempfile.gettempdir(), "sedona_editor_cursors")
+            os.makedirs(folder, exist_ok=True)
+            path = os.path.join(folder, f"link_{role}.cur")
+            if role == "right":
+                _write_cur(path, _arrow_pixels(True), (23, 16))
+            elif role == "left":
+                _write_cur(path, _arrow_pixels(False), (9, 16))
+            else:
+                pixels = _no_entry_pixels()
+                if pixels is None:
+                    raise OSError("no_entry.png missing or unreadable")
+                _write_cur(path, pixels, (16, 16))
+            candidate = "{@" + path.replace("\\", "/") + "}"
+            app_state.canvas.configure(cursor=candidate)    # proves Tk can load it
+            spec = candidate
+        except (OSError, tk.TclError):
+            spec = "no" if role == "no" else fallback
+    _cursors[role] = spec
+    return spec
+
+
+def _set_cursor(role):
+    canvas = app_state.canvas
+    try:
+        canvas.configure(cursor=_cursor(role) if role else "")
+    except tk.TclError:
+        canvas.configure(cursor="")
+
+
+# --------------------------------------------------------------------------- hit test
+
+def slot_at(cx, cy):
+    """The slot row under a canvas point, as a dict, or None.
+
+    Picks the topmost box under the point, so a box lying over another wins, and says
+    which half of the row the point is in.
+    """
+    canvas = app_state.canvas
+    for item in reversed(canvas.find_overlapping(cx, cy, cx, cy)):
+        tags = canvas.gettags(item)
+        if "component" not in tags:
+            continue
+        comp_tag = next((t for t in tags if t.startswith("comp_group_")), None)
+        if comp_tag is None:
+            continue
+        box = wiresheet.get_box_bounds(comp_tag)
+        if box is None:
+            return None
+        zoom = app_state.zoom
+        half_row = wiresheet.SLOT_ROW_HEIGHT * zoom / 2
+        for slot_name, offset in app_state.component_slot_offsets.get(comp_tag, {}).items():
+            row_y = box[1] + offset * zoom
+            if row_y - half_row <= cy < row_y + half_row:
+                return {
+                    "comp_tag": comp_tag,
+                    "comp": app_state.canvas_comp_map.get(comp_tag),
+                    "slot": slot_name,
+                    "side": "right" if cx >= (box[0] + box[2]) / 2 else "left",
+                    "box": box,
+                    "row_y": row_y,
+                    "half_row": half_row,
+                }
+        return None                     # over a header or footer, not a slot
+    return None
+
+
+def title_at(cx, cy):
+    """The comp tag whose title bar is topmost under a canvas point, or None."""
+    canvas = app_state.canvas
+    for item in reversed(canvas.find_overlapping(cx, cy, cx, cy)):
+        tags = canvas.gettags(item)
+        if "component" not in tags:
+            continue
+        comp_tag = next((t for t in tags if t.startswith("comp_group_")), None)
+        if comp_tag is None:
+            continue
+        box = wiresheet.get_box_bounds(comp_tag)
+        if box and box[1] <= cy <= box[1] + wiresheet.HEADER_HEIGHT * app_state.zoom:
+            return comp_tag
+        return None
+    return None
+
+
+def _slot_info(comp, slot_name):
+    for slot in app_state.final_components_registry.get(comp.get("type", ""), []):
+        if slot["name"] == slot_name:
+            return slot
+    return None
+
+
+def _check_link(source, target):
+    """Returns (ok, reason) for a link from one hit slot to another."""
+    if source["comp"] is None or target["comp"] is None:
+        return False, "No component there."
+    if source["comp"] is target["comp"] and source["slot"] == target["slot"]:
+        return False, "A slot cannot be linked to itself."
+    src = _slot_info(source["comp"], source["slot"])
+    tgt = _slot_info(target["comp"], target["slot"])
+    if src is None or tgt is None:
+        return False, "Slot not found in the kit manifest."
+    for slot in (src, tgt):
+        if "a" in slot["flags"] or slot["type"] == "void":
+            return False, f"'{slot['name']}' is an action and cannot be linked."
+    if tgt["readonly"]:
+        return False, f"'{tgt['name']}' is read-only and cannot be a link target."
+    if src["type"] != tgt["type"]:
+        return False, (f"Type mismatch: {source['slot']} is {src['type']}, "
+                       f"{target['slot']} is {tgt['type']}.")
+    from_ref, to_ref = _refs(source, target)
+    links = app_state.xml_root_element.find("links")
+    if links is not None:
+        for link in links.findall("link"):
+            if link.get("from") == from_ref and link.get("to") == to_ref:
+                return False, "That link already exists."
+    return True, f"Link {from_ref} → {to_ref}"
+
+
+def _refs(source, target):
+    root = app_state.xml_root_element
+    return (f"{get_component_path(source['comp'], root)}.{source['slot']}",
+            f"{get_component_path(target['comp'], root)}.{target['slot']}")
+
+
+# --------------------------------------------------------------------------- drawing
+
+def _highlight(hit, color):
+    """Rings the half of a slot row the pointer is over, with a bar on its outer edge."""
+    canvas = app_state.canvas
+    canvas.delete("slot_hover")
+    if hit is None:
+        return
+    left, _, right, _ = hit["box"]
+    mid = (left + right) / 2
+    top, bottom = hit["row_y"] - hit["half_row"], hit["row_y"] + hit["half_row"]
+    x1, x2 = (mid, right - 1) if hit["side"] == "right" else (left + 1, mid)
+    canvas.create_rectangle(x1, top, x2, bottom, outline=color, width=2,
+                            tags=("slot_hover",))
+    edge = right - 2 if hit["side"] == "right" else left + 2
+    canvas.create_line(edge, top, edge, bottom, fill=color, width=4, tags=("slot_hover",))
+    canvas.tag_raise("slot_hover")
+
+
+def _highlight_title(comp_tag, color):
+    """Rings a box's title bar: the drop that opens the Link dialog for that box."""
+    canvas = app_state.canvas
+    canvas.delete("slot_hover")
+    left, top, right, _ = wiresheet.get_box_bounds(comp_tag)
+    canvas.create_rectangle(left + 1, top + 1, right - 1,
+                            top + wiresheet.HEADER_HEIGHT * app_state.zoom,
+                            outline=color, width=2, tags=("slot_hover",))
+    canvas.tag_raise("slot_hover")
+
+
+def _anchor(hit):
+    left, _, right, _ = hit["box"]
+    return (right if hit["side"] == "right" else left), hit["row_y"]
+
+
+def clear():
+    """Drops any hover ring, rubber band and drag state; called on every repaint."""
+    global _press, _drag
+    canvas = app_state.canvas
+    if canvas is None:
+        return
+    canvas.delete("slot_hover")
+    canvas.delete("link_rubber")
+    _press = None
+    _drag = None
+    _set_cursor(None)
+
+
+# --------------------------------------------------------------------------- events
+
+def on_motion(event):
+    """Plain pointer movement: ring the slot half under the pointer."""
+    if _drag is not None or app_state.drag_data.get("tag"):
+        return
+    canvas = app_state.canvas
+    hit = slot_at(canvas.canvasx(event.x), canvas.canvasy(event.y))
+    _highlight(hit, HOVER_COLOR)
+    _set_cursor(hit["side"] if hit else None)
+
+
+def on_leave(_event):
+    if _drag is None:
+        app_state.canvas.delete("slot_hover")
+        _set_cursor(None)
+
+
+def _start_press(event):
+    """Records a press on a slot row as a link drag in waiting; None if not on a slot."""
+    global _press
+    canvas = app_state.canvas
+    hit = slot_at(canvas.canvasx(event.x), canvas.canvasy(event.y))
+    if hit is None or hit["comp"] is None:
+        _press = None
+        return None
+    _press = {"hit": hit, "x": event.x, "y": event.y}
+    return _press
+
+
+def _drag_motion(event):
+    """Pulls the rubber band to the pointer and judges the slot under it, if any."""
+    global _drag
+    canvas = app_state.canvas
+    if _drag is None:
+        if _press is None:
+            return
+        if abs(event.x - _press["x"]) < DRAG_THRESHOLD and                 abs(event.y - _press["y"]) < DRAG_THRESHOLD:
+            return
+        _drag = {"hit": _press["hit"], "anchor": _anchor(_press["hit"])}
+        app_state.set_status("Drop on a slot to link it; release elsewhere to cancel.")
+
+    cx, cy = canvas.canvasx(event.x), canvas.canvasy(event.y)
+    start = _drag["hit"]
+    ax, ay = _drag["anchor"]
+    canvas.delete("link_rubber")
+    canvas.create_line(ax, ay, cx, cy, fill=RUBBER_COLOR, width=2, dash=(4, 2),
+                       tags=("link_rubber",))
+    canvas.tag_raise("link_rubber")
+
+    outgoing = start["side"] == "right"
+    hit = slot_at(cx, cy)
+    if hit is None:
+        title_tag = title_at(cx, cy)
+        if title_tag is not None:
+            # Its own title too: a component may link one of its slots to another.
+            _highlight_title(title_tag, DROP_OK_COLOR)
+            _set_cursor("right" if outgoing else "left")
+            app_state.set_status("Drop to pick the other slot in the Link dialog.")
+            return
+    if hit is None or (hit["comp_tag"] == start["comp_tag"] and hit["slot"] == start["slot"]):
+        canvas.delete("slot_hover")
+        _set_cursor(None)
+        return
+    ok, reason = _check_link(start, hit) if outgoing else _check_link(hit, start)
+    # Ring the side of the drop slot the link would attach to, not the side under the
+    # pointer: a link always arrives on the left of a row and leaves from its right.
+    shown = dict(hit, side="left" if outgoing else "right")
+    _highlight(shown, DROP_OK_COLOR if ok else DROP_BAD_COLOR)
+    _set_cursor(("right" if outgoing else "left") if ok else "no")
+    app_state.set_status(reason, warn=not ok)
+
+
+def _finish(event):
+    """Ends a press. Returns 'link' after a drag (made or refused), 'click' after a
+    press that never moved, None if no press on a slot was pending."""
+    global _press, _drag
+    canvas = app_state.canvas
+    press, drag = _press, _drag
+    _press = _drag = None
+    canvas.delete("link_rubber")
+    canvas.delete("slot_hover")
+    _set_cursor(None)
+
+    if drag is None:
+        return "click" if press is not None else None
+
+    cx, cy = canvas.canvasx(event.x), canvas.canvasy(event.y)
+    hit = slot_at(cx, cy)
+    start = drag["hit"]
+    title_tag = title_at(cx, cy) if hit is None else None
+    if title_tag is not None:
+        other = app_state.canvas_comp_map.get(title_tag)
+        if other is None:
+            app_state.set_status("Link cancelled.")
+        elif start["side"] == "right":
+            _link_dialog(start["comp"], other, start["slot"], None)
+        else:
+            _link_dialog(other, start["comp"], None, start["slot"])
+        return "link"
+    if hit is None or (hit["comp_tag"] == start["comp_tag"] and hit["slot"] == start["slot"]):
+        app_state.set_status("Link cancelled.")
+        return "link"
+    source, target = (start, hit) if start["side"] == "right" else (hit, start)
+    ok, reason = _check_link(source, target)
+    if not ok:
+        app_state.set_status(f"Cannot link: {reason}", warn=True)
+        return "link"
+    from_ref, to_ref = _refs(source, target)
+    sax_file.add_link(from_ref, to_ref)
+    app_state.set_status(f"Linked {from_ref} → {to_ref}")
+    return "link"
+
+
+# Right button: on a slot it drags a link, and a press that never moves is the menu.
+
+def on_right_press(event):
+    if _start_press(event) is None:
+        _menu_callback(event)
+
+
+def on_right_motion(event):
+    _drag_motion(event)
+
+
+def on_right_release(event):
+    if _finish(event) == "click":
+        _menu_callback(event)
+
+
+# Left button: anywhere on a box selects it. Only the title bar moves it; a slot row
+# drags out a link, and the rest of the box does nothing more than select.
+
+def _on_title_bar(comp_tag, cy):
+    box = wiresheet.get_box_bounds(comp_tag)
+    return box is not None and box[1] <= cy <= box[1] + wiresheet.HEADER_HEIGHT * app_state.zoom
+
+
+def on_left_press(event):
+    _box_handlers["press"](event)               # selection, and arms a box move
+    if _start_press(event) is not None:
+        app_state.canvas.delete("slot_hover")
+    comp_tag = app_state.drag_data.get("tag")
+    if comp_tag and not _on_title_bar(comp_tag, app_state.canvas.canvasy(event.y)):
+        app_state.drag_data["tag"] = None       # selected, but not picked up
+
+
+def on_left_motion(event):
+    if _press is not None or _drag is not None:
+        _drag_motion(event)
+    else:
+        _box_handlers["motion"](event)
+
+
+def on_left_release(event):
+    if _finish(event) is None:
+        _box_handlers["release"](event)
+
+
+_box_handlers = {}
+
+
+def install(canvas, menu_callback, box_press, box_motion, box_release, link_dialog):
+    """Binds hover, link dragging on both buttons, and the box handlers it wraps.
+
+    menu_callback opens the context menu; box_* are the sheet's own left-button
+    select-and-move handlers, which still run whenever a press is not on a slot row;
+    link_dialog opens the Link dialog when a link is dropped on a title bar.
+    """
+    global _menu_callback, _link_dialog
+    _menu_callback = menu_callback
+    _link_dialog = link_dialog
+    _box_handlers.update(press=box_press, motion=box_motion, release=box_release)
+    canvas.bind("<Motion>", on_motion)
+    canvas.bind("<Leave>", on_leave, add="+")
+    canvas.bind("<ButtonPress-1>", on_left_press)
+    canvas.bind("<B1-Motion>", on_left_motion)
+    canvas.bind("<ButtonRelease-1>", on_left_release)
+    canvas.bind("<ButtonPress-3>", on_right_press)
+    canvas.bind("<B3-Motion>", on_right_motion)
+    canvas.bind("<ButtonRelease-3>", on_right_release)

main.py

@@ -10,6 +10,7 @@ import threading
 import app_state
 import connect_dialog
 import device_session
+import link_drag
 import link_view
 import live_hooks
 import manage_kits
@@ -1201,8 +1202,12 @@ def _slot_linkable(slot_flags, slot_type, readonly, is_target):
     return True
 
 
-def open_link_dialog(source_element, target_element):
-    """Opens a dialog to select source and target slots, validates types, and creates a link."""
+def open_link_dialog(source_element, target_element, source_slot=None, target_slot=None):
+    """Opens a dialog to select source and target slots, validates types, and creates a link.
+
+    source_slot / target_slot pre-select a slot on that side, as when a link dragged out
+    of a slot is dropped on a component's title bar rather than on one of its slots.
+    """
     window = app_state.window
 
     sides = [source_element, target_element]
@@ -1346,6 +1351,11 @@ def open_link_dialog(source_element, target_element):
     ttk.Button(mid_frame, text="⇄", width=3, command=on_swap).pack(pady=5)
 
     refresh_panels()
+    for var, slot, info, is_target in ((src_var, source_slot, src_slot_info, False),
+                                       (tgt_var, target_slot, tgt_slot_info, True)):
+        if slot in info and _slot_linkable(info[slot][1], info[slot][0], info[slot][2],
+                                           is_target):
+            var.set(slot)
 
     status_label = tk.Label(main_frame, textvariable=status_var, anchor="w", fg="#333333")
     status_label.grid(row=1, column=0, columnspan=3, sticky="w", pady=(8, 0))
@@ -2804,7 +2814,11 @@ def refresh_palette_kits():
     if _schema_has_incomplete_checksums():
         palette_kit_names = []
     else:
-        palette_kit_names = sorted(app_state.active_schema_kits.keys())
+        # A kit with nothing placeable (all abstract or @palette=false) is left out.
+        palette_kit_names = [
+            kit_name for kit_name in sorted(app_state.active_schema_kits.keys())
+            if palette.list_component_types(kit_name)
+        ]
 
     labels = []
     for kit_name in palette_kit_names:
@@ -2966,12 +2980,13 @@ canvas.pack(fill=tk.BOTH, expand=True)
 canvas_vscroll.config(command=canvas.yview)
 canvas_hscroll.config(command=canvas.xview)
 
-canvas.bind("<ButtonPress-1>", on_canvas_click)
-canvas.bind("<B1-Motion>", on_canvas_drag)
-canvas.bind("<ButtonRelease-1>", on_canvas_release)
 canvas.bind("<Configure>", lambda e: wiresheet.draw_grid())
 
-canvas.bind("<ButtonPress-3>", on_canvas_right_click)
+# Either button pressed on a slot row drags out a new link. Elsewhere the left button
+# selects and moves boxes and a plain right click is the menu, as before.
+link_drag.install(canvas, on_canvas_right_click,
+                  on_canvas_click, on_canvas_drag, on_canvas_release,
+                  link_dialog=open_link_dialog)
 canvas.bind("<ButtonPress-2>", on_canvas_right_click)
 canvas.bind("<Double-1>", on_canvas_double_click)
 

palette.py

@@ -227,11 +227,25 @@ def _is_component(qualified_name, seen=None):
     return result
 
 
+def _hidden_from_palette(type_element):
+    """True when the type's own facets carry @palette=false.
+
+    Only the type-level <facets> counts; slots have <facets> of their own nested deeper.
+    """
+    facets = type_element.find("facets")
+    if facets is None:
+        return False
+    for facet in facets.findall("bool"):
+        if facet.get("name") == "palette" and facet.get("val") == "false":
+            return True
+    return False
+
+
 def list_component_types(kit_name):
     """Concrete component types in a kit, as (type name, base) pairs.
 
-    Primitives (no base) and abstract types (the 'a' flag) are left out — neither can be
-    placed in an application.
+    Primitives (no base), abstract types (the 'a' flag) and types marked @palette=false
+    are left out — none of them belong in the palette.
     """
     _, types = _load_kit(kit_name)
 
@@ -239,6 +253,8 @@ def list_component_types(kit_name):
     for type_name, type_element in types.items():
         if "a" in (type_element.get("flags") or ""):
             continue
+        if _hidden_from_palette(type_element):
+            continue
         if not _is_component(f"{kit_name}::{type_name}"):
             continue
         entries.append((type_name, type_element.get("base") or ""))

wiresheet.py

@@ -948,6 +948,7 @@ def render_components(components_to_render):
 
     canvas.delete("component")
     canvas.delete("link")
+    canvas.delete("slot_hover")   # link_drag's hover ring, stale once boxes repaint
     app_state.canvas_comp_map.clear()
     app_state.canvas_tag_by_element.clear()
     app_state.component_slot_offsets.clear()