fix example query_group_by_callback + add snapshot

flecs_ecs/examples/query_group_by_callbacks.rs

@@ -41,10 +41,10 @@ extern "C" fn callback_group_create(
 extern "C" fn callback_group_delete(
     world: *mut WorldT,
     group_id: u64,
-    ctx: *mut c_void,
-    _group_by_arg: *mut c_void,
+    _ctx: *mut c_void,
+    group_by_ctx: *mut c_void,
 ) {
-    let snap = unsafe { &mut *(ctx as *mut Snap) };
+    let snap = unsafe { &mut *(group_by_ctx as *mut Snap) };
 
     let world_ref = unsafe { WorldRef::from_ptr(world) };
     fprintln!(
@@ -54,6 +54,7 @@ extern "C" fn callback_group_delete(
     );
 
     // if you have any data associated with the group, you need to free it
+    // or use the callback group_by_ctx where you pass a context to the callback
 }
 
 fn main() {

flecs_ecs/examples/snapshots/query_group_by_callbacks__common__test.snap

@@ -0,0 +1,32 @@
+---
+source: flecs_ecs/examples/common.rs
+expression: self.str
+---
+- "\n"
+- "Group created: \"Third\""
+- "\n"
+- "Group created: \"Second\""
+- "\n"
+- "Group created: \"First\""
+- "\n"
+- "Group: \"::query_group_by_callbacks::common::First\" - Table: [Some(query_group_by_callbacks.common.Position, (query_group_by_callbacks.common.Group,query_group_by_callbacks.common.First))] - Counter: 3"
+- " [Position { x: 3.0, y: 3.0 }]"
+- "\n"
+- "Group: \"::query_group_by_callbacks::common::First\" - Table: [Some(query_group_by_callbacks.common.Position, query_group_by_callbacks.common.Tag, (query_group_by_callbacks.common.Group,query_group_by_callbacks.common.First))] - Counter: 3"
+- " [Position { x: 6.0, y: 6.0 }]"
+- "\n"
+- "Group: \"::query_group_by_callbacks::common::Second\" - Table: [Some(query_group_by_callbacks.common.Position, (query_group_by_callbacks.common.Group,query_group_by_callbacks.common.Second))] - Counter: 2"
+- " [Position { x: 2.0, y: 2.0 }]"
+- "\n"
+- "Group: \"::query_group_by_callbacks::common::Second\" - Table: [Some(query_group_by_callbacks.common.Position, query_group_by_callbacks.common.Tag, (query_group_by_callbacks.common.Group,query_group_by_callbacks.common.Second))] - Counter: 2"
+- " [Position { x: 5.0, y: 5.0 }]"
+- "\n"
+- "Group: \"::query_group_by_callbacks::common::Third\" - Table: [Some(query_group_by_callbacks.common.Position, (query_group_by_callbacks.common.Group,query_group_by_callbacks.common.Third))] - Counter: 1"
+- " [Position { x: 1.0, y: 1.0 }]"
+- "\n"
+- "Group: \"::query_group_by_callbacks::common::Third\" - Table: [Some(query_group_by_callbacks.common.Position, query_group_by_callbacks.common.Tag, (query_group_by_callbacks.common.Group,query_group_by_callbacks.common.Third))] - Counter: 1"
+- " [Position { x: 4.0, y: 4.0 }]"
+- "\n"
+- "Group deleted: \"Second\""
+- "Group deleted: \"First\""
+- "Group deleted: \"Third\""