Keep linear dimensions associated with sources

src/command.rs

@@ -1212,6 +1212,11 @@ pub enum CmdResult {
     CommitEntitiesAndExit(Vec<EntityType>),
     /// Commit an acadrust entity to the document and end the command.
     CommitAndExit(EntityType),
+    /// Commit an object-selected linear dimension and retain its source link.
+    CommitAssociativeDimension {
+        entity: EntityType,
+        source: Handle,
+    },
     /// Commit a Model-tab 3D solid: the acadrust entity (for selection /
     /// persistence) plus its B-rep (cached for boolean ops + shaded
     /// rendering). Ends the command.