Configurations: a configuration table of rows (parameter expressions and feature suppressions per row) that switch the design (config.activate: undoable, all or nothing), kept through parameter renames and feature deletes; FusionStartDesignConfigModeCmd, FusionShowDesignConfigPanelCmd (with whether the design still matches the active row), config.column, config.row

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/doc/src/params.rs

@@ -650,6 +650,17 @@ impl Document {
         if self.favorites.remove(old) {
             self.favorites.insert(new.to_string());
         }
+        for c in &mut self.configs.columns {
+            if *c == crate::config::Column::Param(old.to_string()) {
+                *c = crate::config::Column::Param(new.to_string());
+            }
+        }
+        // Configuration cells refer to parameters too.
+        for r in &mut self.configs.rows {
+            for cell in &mut r.cells {
+                *cell = expr::rename_reference(cell, old, new);
+            }
+        }
         if let Some(c) = self.param_comments.remove(old) {
             self.param_comments.insert(new.to_string(), c);
         }