Add CTRL+ALT+Click regex-search dialog to five select operators

Opens a props dialog prefilled with the active object's value (key
value, type name, material name, group name, or aggregate name), then
matches it as an unanchored Python regex (entering foo behaves like
.*foo.*) with an Add / Remove / Filter action dropdown and an "Also
Unhide Hidden Objects" checkbox. Applied to select_similar,
select_similar_type, select_by_material, select_group_elements and
select_aggregate.

Multi-match operators (groups, aggregates) union their matches before
a single Spatial.select_products call so Filter cannot wrongly
intersect per-match. select_aggregate matches only IfcElement
aggregates, excluding spatial decomposition, and exposes Also Select
Parts / One Level Deep in the dialog. The equivalent selector query
(e.g. material = /.*foo.*/) is copied to the clipboard.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/dev-notes/Additional_Selection_and_Deselection_Tools.md

@@ -27,6 +27,7 @@ One modifier scheme, applied uniformly across nine operators:
 | CTRL+Click | **filter** the selection to matches only (selects nothing new) |
 | CTRL+SHIFT+Click | legacy plain-CTRL function, where one existed |
 | ALT+Click | also unhide matches (viewport + local hide) — from the base branch |
+| CTRL+ALT+Click | `select_similar`, `select_similar_type`, `select_by_material`, `select_group_elements`, `select_aggregate`: regex-search dialog (see below) |
 
 Operators covered: `bim.select_similar`, `bim.select_ifc_class`,
 `bim.select_similar_type`, `bim.select_by_material`, `bim.select_similar_container`,
@@ -63,6 +64,40 @@ Operators covered: `bim.select_similar`, `bim.select_ifc_class`,
 - **`select_ifc_class` filter matches subtypes** (`element.is_a(cls)`), consistent
   with normal select mode which uses `file.by_type(cls)` (also subtype-inclusive).
 
+### Regex-search dialog on `select_similar`, `select_similar_type`, `select_by_material`, `select_group_elements`, `select_aggregate` (CTRL+ALT+Click)
+
+On `select_aggregate` the pattern is prefilled with the active object's **aggregate
+name** and matched against every `IfcRelAggregates.RelatingObject` that `is_a
+IfcElement` (spatial decomposition — project/site/storey — deliberately excluded);
+the dialog additionally exposes "Also Select Parts" (+ "One Level Deep") since the
+panel's two button variants collapse into one dialog. Union of matched aggregates
+(+ parts via `get_parts`/`get_decomposition`) through one `Spatial.select_products`
+call; clipboard query `parent = /.*foo.*/`.
+
+On `select_similar_type` the pattern is prefilled with (and matched against) the active
+object's **type name**; the clipboard query is `type = /.*foo.*/`. On
+`select_by_material` it is the active object's **resolved material name** (via the
+#7940 helpers: usage → set, clicked-layer index as hint, `_get_name`), falling back to
+the clicked material row's name; clipboard query `material = /.*foo.*/`. On
+`select_group_elements` it is the clicked group row's **name**, matched against all
+`IfcGroup` names in the file (unnamed groups never match); the union of the matching
+groups' elements (recursive by default) goes through a single
+`Spatial.select_products` call — union first, so FILTER cannot wrongly intersect
+per-group; clipboard query `group = /.*foo.*/`. Otherwise identical to the
+`select_similar` behavior below.
+
+Opens a props dialog prefilled with the active object's value for the clicked key; the
+(possibly edited) text is compiled as an unanchored Python regex (`re.search`, so
+entering `foo` behaves like `.*foo.*`) and applied via an Add / Remove / Filter
+dropdown, plus an "Also Unhide Hidden Objects" checkbox (reuses `should_unhide`; in
+Add/Remove it sweeps `scene.objects` instead of `visible_objects` and clears both
+hide flags on matches; a no-op in Filter since selected objects are visible). CTRL+ALT was free in practice: ALT (unhide) is a no-op in filter mode, which
+plain CTRL triggers. Invalid patterns error out and cancel. The equivalent selector
+query (`Key = /.*foo.*/`) is copied to the clipboard. Note the prefill is the raw
+value — values containing regex metacharacters (e.g. `(`) need escaping before OK.
+Overriding `draw()` for the dialog means the F9 redo panel no longer auto-lists the
+operator's internal properties for normal runs (it was exposing internals anyway).
+
 ### Deliberately overwritten SHIFT bindings (to be reworked later)
 
 Two operators already used SHIFT; the owner chose to overwrite them and revisit with