🐛 Fix repeateable keys triggering an infinite React loop in text editor v2

frontend/src/app/main/data/workspace/texts.cljs

@@ -55,6 +55,7 @@
 
 (declare v2-update-text-shape-content)
 (declare v2-update-text-editor-styles)
+(declare v2-sync-wasm-text-layout)
 
 ;; -- Content helpers
 
@@ -907,10 +908,43 @@
   (ptk/reify ::v2-update-text-editor-styles
     ptk/UpdateEvent
     (update [_ state]
+      ;; `stylechange` can fire on every `selectionchange` while typing.
+      ;; Avoid swapping the global store when the computed styles are unchanged,
+      ;; otherwise we can end up in store->rerender->selectionchange loops.
       (let [merged-styles (merge (txt/get-default-text-attrs)
                                  (get-in state [:workspace-global :default-font])
-                                 new-styles)]
-        (update-in state [:workspace-v2-editor-state id] (fnil merge {}) merged-styles)))))
+                                 new-styles)
+            prev (get-in state [:workspace-v2-editor-state id])]
+        (if (= merged-styles prev)
+          state
+          (assoc-in state [:workspace-v2-editor-state id] merged-styles))))))
+
+(defn v2-sync-wasm-text-layout
+  "Live-sync WASM text layout from the DOM editor without writing shape :content.
+  Intended to be called from Text Editor v2 `needslayout` events (coalesced)."
+  [id content]
+  (ptk/reify ::v2-sync-wasm-text-layout
+    ptk/WatchEvent
+    (watch [_ state _]
+      (let [objects (dsh/lookup-page-objects state)
+            shape   (get objects id)]
+        (if-not (and (some? shape) (cfh/text-shape? shape))
+          (rx/empty)
+          (let [new-size  (dwwt/get-wasm-text-new-size shape content)
+                modifiers (when (and (some? new-size)
+                                     (not= :fixed (:grow-type shape)))
+                            (dwwt/resize-wasm-text-modifiers shape content))]
+            ;; `get-wasm-text-new-size` has the side effect of syncing WASM's internal text
+            ;; content/layout. Only non-fixed grow-types need geometry modifiers updates.
+            (if (some? modifiers)
+              (rx/of (dwm/set-wasm-modifiers modifiers))
+              (rx/empty))))))
+
+    ptk/EffectEvent
+    (effect [_ _ _]
+      ;; While typing, v2 only commits shape :content on debounced `change`.
+      ;; We still need to repaint the WASM canvas for live preview.
+      (wasm.api/request-render "text-editor-v2-needslayout"))))
 
 (defn v2-update-text-shape-position-data
   [shape-id position-data]

frontend/src/app/main/ui/workspace/shapes/text/v2_editor.cljs

@@ -33,6 +33,7 @@
    [app.util.object :as obj]
    [app.util.text.content :as content]
    [app.util.text.content.styles :as styles]
+   [app.util.timers :as ts]
    [cuerdas.core :as str]
    [rumext.v2 :as mf]))
 
@@ -48,6 +49,20 @@
           result (.-textContent editor-root)]
       (when (not= result "") result))))
 
+(defn coalesce-per-tick
+  "Return a function that runs `f` at most once per JS tick.
+  Rationale: `needslayout` can fire on every input (including key repeat). We want
+  to break nested store update loops."
+  [f]
+  (let [scheduled?* (atom false)]
+    (fn []
+      (when-not @scheduled?*
+        (reset! scheduled?* true)
+        (ts/asap
+         (fn []
+           (reset! scheduled?* false)
+           (f)))))))
+
 (defn- get-fonts
   [content]
   (let [extract-fn (juxt :font-id :font-variant-id)
@@ -136,14 +151,16 @@
             (st/emit! (dwt/v2-update-text-editor-styles shape-id styles))))
 
         on-needs-layout
-        (fn []
-          (when-let [content (content/dom->cljs (dwt/get-editor-root instance))]
-            (st/emit! (dwt/v2-update-text-shape-content shape-id content
-                                                        :update-name? true
-                                                        :save-undo? false)))
-          ;; FIXME: We need to find a better way to trigger layout changes.
-          #_(st/emit!
-             (dwt/v2-update-text-shape-position-data shape-id [])))
+        (coalesce-per-tick
+         (fn []
+           (when-let [content (content/dom->cljs (dwt/get-editor-root instance))]
+             ;; For WASM renderer, use the dedicated layout sync to avoid touching shape content
+             ;; during `needslayout` bursts. For non-wasm, keep existing behavior.
+             (if (features/active-feature? @st/state "render-wasm/v1")
+               (st/emit! (dwt/v2-sync-wasm-text-layout shape-id content))
+               (st/emit! (dwt/v2-update-text-shape-content shape-id content
+                                                           :update-name? true
+                                                           :save-undo? false))))))
 
         on-change
         (fn []