fix(layers): VP glyph and filter-aware shift ranges

VP-freeze columns used the global-freeze glyph; shift-ranges swept filtered-out rows into bulk ops. Glyph swapped to layer_vp_freeze (ribbon precedent); new visible_indices helper shared by the view loop and the shift arm. Test: shift_select_skips_filtered_out_rows (RED: hidden row in range). Full suite: 2028 passed / 0 failed / 25 ignored.

src/app/update/command.rs

@@ -4787,6 +4787,35 @@ mod layer_name_target_tests {
         );
     }
 
+    #[test]
+    fn shift_select_skips_filtered_out_rows() {
+        // #50: rows hidden by the live filter must not join a shift-range.
+        // Sorted panel: A1(0), B9(1), C1(2); filter "1" hides B9.
+        let mut app = OpenCADStudio::new_for_test();
+        app.automation_op(r#"{"op":"new"}"#);
+        for new in ["C1", "B9", "A1"] {
+            let _ = app.on_layer_new();
+            let fresh = app.tabs[app.active_tab].layers.edit_buf.clone();
+            rename_layer(&mut app, &fresh, new);
+        }
+        let i = app.active_tab;
+        app.tabs[i].layers.filter = "1".to_string();
+        let _ = app.update(Message::LayerSelect("A1".to_string()));
+        app.shift_down = true;
+        let _ = app.update(Message::LayerSelect("C1".to_string()));
+        app.shift_down = false;
+        let multi = app.tabs[i].layers.selected_multi.clone();
+        let names: Vec<String> = multi
+            .iter()
+            .filter_map(|&x| app.tabs[i].layers.layers.get(x).map(|l| l.name.clone()))
+            .collect();
+        assert!(
+            !names.contains(&"B9".to_string()),
+            "hidden row must not join the range, got {names:?}"
+        );
+        assert!(names.contains(&"A1".to_string()) && names.contains(&"C1".to_string()));
+    }
+
     #[test]
     fn layer_toggle_visible_unknown_name_is_noop() {
         let mut app = app_with_zulu_alpha();

src/app/update/mod.rs

@@ -3590,10 +3590,14 @@ impl OpenCADStudio {
                         panel.selected_multi.push(idx);
                     }
                 } else if shift {
-                    // Shift-click selects the range from the anchor to here.
+                    // Shift-click selects the range from the anchor to here —
+                    // visible rows only, so filtered-out rows between them
+                    // cannot join bulk edits/deletes (#50).
                     let anchor = panel.selected.unwrap_or(idx);
                     let (lo, hi) = (anchor.min(idx), anchor.max(idx));
-                    panel.selected_multi = (lo..=hi).collect();
+                    let visible: std::collections::HashSet<usize> =
+                        panel.visible_indices().into_iter().collect();
+                    panel.selected_multi = (lo..=hi).filter(|r| visible.contains(r)).collect();
                 } else if !panel.selected_multi.contains(&idx) {
                     // Plain click collapses to this row — but NOT when it is
                     // already part of a multi-selection, so clicking a property

src/ui/window/layers.rs

@@ -327,6 +327,21 @@ impl LayerPanel {
         self.linetype_items = items;
     }
 
+    /// Row indices passing the live name filter — the rows the view actually
+    /// draws. Index math over "what the user sees" (shift-ranges) must use
+    /// these; raw `selected_multi` ranges would sweep in hidden rows (#50).
+    pub fn visible_indices(&self) -> Vec<usize> {
+        let filter = self.filter.to_lowercase();
+        self.layers
+            .iter()
+            .enumerate()
+            .filter(|(_, layer)| {
+                filter.is_empty() || layer.name.to_lowercase().contains(&filter)
+            })
+            .map(|(i, _)| i)
+            .collect()
+    }
+
     /// Render the layer panel as the full content of its own OS window.
     pub fn view_window(
         &self,
@@ -453,11 +468,8 @@ impl LayerPanel {
 
         // ── Layer rows ────────────────────────────────────────────────────
         let mut rows_col = column![].spacing(0);
-        let filter = self.filter.to_lowercase();
-        for (i, layer) in self.layers.iter().enumerate() {
-            if !filter.is_empty() && !layer.name.to_lowercase().contains(&filter) {
-                continue;
-            }
+        for i in self.visible_indices() {
+            let layer = &self.layers[i];
             // Highlight every selected row; show the editable combos only on the
             // anchor (a single shared combo state can't drive several rows).
             let is_anchor = self.selected == Some(i);
@@ -896,7 +908,7 @@ fn layer_row<'a>(
     // Per-viewport freeze columns
     for (vp_idx, _vp_col) in vp_cols.iter().enumerate() {
         let is_vp_frozen = layer.vp_frozen.get(vp_idx).copied().unwrap_or(false);
-        let vp_frz_svg = crate::ui::icons::layer_freeze(is_vp_frozen);
+        let vp_frz_svg = crate::ui::icons::layer_vp_freeze(is_vp_frozen);
         row_content = row_content.push(
             container(svg_btn(
                 vp_frz_svg,