From 2b8344d3a87d49dacea097e223877e064ee8af5a Mon Sep 17 00:00:00 2001
From: Alonso Torres <alonso.torres@kaleidos.net>
Date: Mon, 28 Sep 2026 09:06:47 +0200
Subject: [PATCH] :bug: Fix delete on curve handlers (#11896)

---
 .../app/main/data/workspace/path/tools.cljs   | 42 ++++++++++++++-----
 .../frontend_tests/logic/path_tools_test.cljs | 29 +++++++++++++
 2 files changed, 60 insertions(+), 11 deletions(-)

diff --git a/frontend/src/app/main/data/workspace/path/tools.cljs b/frontend/src/app/main/data/workspace/path/tools.cljs
index 1ab572d7bf..fe25a9e13e 100644
--- a/frontend/src/app/main/data/workspace/path/tools.cljs
+++ b/frontend/src/app/main/data/workspace/path/tools.cljs
@@ -229,20 +229,35 @@
           (update-path-content state (path/toggle-segment-curve content index))
           state)))))
 
-(defn remove-handler
-  "Collapses one handler onto its node, which becomes independent."
-  [index prefix]
-  (ptk/reify ::remove-handler
+(defn remove-handlers
+  "Collapses handlers `[index prefix]` onto their nodes, which become
+  independent."
+  [handlers]
+  (ptk/reify ::remove-handlers
     ptk/UpdateEvent
     (update [_ state]
       (let [id      (st/get-path-id state)
             content (st/get-path state :content)]
-        (if (some? content)
-          (-> (update-path-content state (path/collapse-handler content index prefix))
-              (update-in [:workspace-local :edit-path id :handler-types]
-                         dissoc (helpers/handler-node-index index prefix)))
+        (if (and (some? content) (seq handlers))
+          (let [new-content (reduce (fn [content [index prefix]]
+                                      (path/collapse-handler content index prefix))
+                                    content
+                                    handlers)
+                nodes       (map (fn [[index prefix]]
+                                   (helpers/handler-node-index index prefix))
+                                 handlers)]
+            (-> (update-path-content state new-content)
+                (update-in [:workspace-local :edit-path id :handler-types]
+                           #(apply dissoc % nodes))
+                (update-in [:workspace-local :edit-path id :selection :handlers]
+                           #(reduce disj (or % #{}) handlers))))
           state)))))
 
+(defn remove-handler
+  "Collapses one handler onto its node, which becomes independent."
+  [index prefix]
+  (remove-handlers #{[index prefix]}))
+
 (defn merge-nodes []
   (process-path-tool path/merge-nodes))
 
@@ -287,7 +302,8 @@
        (path/separate-nodes content points offset)))))
 
 (defn delete-selected
-  "Heals selected nodes or opens selected segments."
+  "Heals selected nodes, opens selected segments or collapses selected
+  handlers."
   []
   (ptk/reify ::delete-selected
     ptk/WatchEvent
@@ -296,17 +312,21 @@
             content   (st/get-path state :content)
             selection (st/get-selection state id)
             nodes     (get selection :nodes #{})
-            segments  (get selection :segments #{})]
+            segments  (get selection :segments #{})
+            handlers  (get selection :handlers #{})]
         (rx/of
          (cond
            ;; Node selection takes priority in mixed selections.
            (seq nodes)
            (process-path-tool (helpers/node-positions content nodes) path/remove-nodes)
 
-           ;; Segment-only selection opens the path.
+           ;; Segment selection opens the path.
            (seq segments)
            (separate-nodes)
 
+           (seq handlers)
+           (remove-handlers handlers)
+
            :else
            (remove-node)))))))
 
diff --git a/frontend/test/frontend_tests/logic/path_tools_test.cljs b/frontend/test/frontend_tests/logic/path_tools_test.cljs
index fc5aa33785..0509c991cb 100644
--- a/frontend/test/frontend_tests/logic/path_tools_test.cljs
+++ b/frontend/test/frontend_tests/logic/path_tools_test.cljs
@@ -517,6 +517,35 @@
       (t/is (< (nodes mixed) 4))
       (t/is (= 1 (move-tos mixed))))))
 
+(t/deftest delete-selected-collapses-selected-handlers
+  (let [id      (random-uuid)
+        content (pth/selectable-path-content)
+        run     (fn [handlers]
+                  (let [state  (pth/selectable-path-state
+                                id content {:nodes #{} :segments #{} :handlers handlers})
+                        events (atom [])]
+                    (->> (ptk/watch (path.tools/delete-selected) state nil)
+                         (rx/subs! #(swap! events conj %)))
+                    (ptk/update (first @events) state)))
+        content-of   (fn [st] (vec (get-in st [:workspace-drawing :object :content])))
+        selection-of (fn [st] (get-in st [:workspace-local :edit-path id :selection]))]
+
+    (t/testing "single handler collapses onto its node"
+      (let [state'   (run #{[2 :c1]})
+            content' (content-of state')]
+        (t/is (= (gpt/point 10 0) (path/get-handler-point content' 2 :c1)))
+        (t/is (= (gpt/point 18 0) (path/get-handler-point content' 2 :c2)))
+        (t/is (= (gpt/point 8 0) (path/get-handler-point content' 1 :c2)))
+        (t/is (empty? (:handlers (selection-of state'))))))
+
+    (t/testing "multiple handlers collapse and flat curves become lines"
+      (let [state'   (run #{[1 :c1] [1 :c2] [2 :c1]})
+            content' (content-of state')]
+        (t/is (= [:move-to :line-to :curve-to] (mapv :command content')))
+        (t/is (= (gpt/point 10 0) (path/get-handler-point content' 2 :c1)))
+        (t/is (= (gpt/point 18 0) (path/get-handler-point content' 2 :c2)))
+        (t/is (empty? (:handlers (selection-of state'))))))))
+
 (t/deftest deleting-a-closed-seam-node-heals-its-adjacent-segments
   (let [id       (random-uuid)
         content  (path/content