Merge pull request #1613 from ramox81/codex/sheet-set-manager

Sheet Set Manager, NEWSHEETSET / OPENSHEETSET and sheet set fields, with review fixes.

# Conflicts:
#	Cargo.lock
#	src/app/control/actions.rs
#	src/app/mod.rs
#	src/app/settings.rs
#	src/app/update/dialog.rs
#	src/app/update/file.rs
#	src/app/update/mod.rs
#	src/app/view/mod.rs
#	src/ui/dock.rs
#	src/ui/ribbon/mod.rs
#	src/ui/window/field_dialog.rs
#	src/ui/window/mod.rs

src/app/mod.rs

@@ -819,6 +819,13 @@ pub(super) struct OpenCADStudio {
     /// Point Cloud Manager palette (POINTCLOUDMANAGER).
     pub(crate) pc_manager: crate::ui::window::pc_manager::PcManager,
     pub(crate) count_palette: crate::ui::window::count_palette::CountPalette,
+    /// Sheet Set Manager palette, the open sheet sets and their dialogs.
+    pub(crate) sheet_set: crate::ui::window::sheet_set::SheetSetManager,
+    /// A sheet opened from the manager: its drawing (path key) and layout,
+    /// switched to once the drawing has loaded.
+    pub(crate) sheet_set_pending_layout: Option<(String, String)>,
+    /// The subset / set Import Layout as Sheet adds to, while its file picker is open.
+    pub(crate) sheet_set_import_parent: Option<String>,
     /// Which viewport background the colour wheel is editing, or `None` when
     /// it is closed. One slot, because only one wheel can be open at a time.
     pub(crate) bg_picker: Option<BgTarget>,
@@ -1992,6 +1999,8 @@ pub enum ModalKind {
     GpuWarning,
     /// Reference Manager help window (toolbar Help button).
     XrefHelp,
+    /// Sheet set wizard, properties and sheet / subset forms.
+    SheetSet,
 }
 
 /// A property group controlled by a layer state's restore mask.
@@ -3902,6 +3911,7 @@ pub enum Message {
     /// A click or search in the Point Cloud Manager.
     PcManager(crate::ui::window::pc_manager::PcManagerMsg),
     Count(crate::ui::window::count_palette::CountMsg),
+    SheetSet(crate::ui::window::sheet_set::SheetSetMsg),
     PdfImportPickResult(Result<(std::path::PathBuf, std::sync::Arc<Vec<u8>>), String>),
     /// Result of the PDFATTACH file picker.
     PdfAttachPickResult(Result<(std::path::PathBuf, std::sync::Arc<Vec<u8>>), String>),
@@ -4229,6 +4239,9 @@ impl OpenCADStudio {
             show_browser: false,
             pc_manager: Default::default(),
             count_palette: Default::default(),
+            sheet_set: Default::default(),
+            sheet_set_pending_layout: None,
+            sheet_set_import_parent: None,
             bg_picker: None,
             block_palette: Default::default(),
             xref_manager: Default::default(),