🐛 Fix errors in thumbnails

frontend/src/app/render_wasm/api.cljs

@@ -334,7 +334,7 @@
 
 (defn request-render
   [_requester]
-  (when (and wasm/context-initialized? (not @wasm/context-lost?))
+  (when (and wasm/context-initialized? (not @wasm/context-lost?) (not @wasm/disable-request-render?))
     (if @shapes-loading?
       (register-deferred-render!)
       (when-not @pending-render
@@ -1698,6 +1698,8 @@
   []
   (when wasm/context-initialized?
     (try
+      (set! wasm/context-initialized? false)
+
       ;; Cancel any pending animation frame to prevent race conditions
       (when wasm/internal-frame-id
         (js/cancelAnimationFrame wasm/internal-frame-id)
@@ -1708,8 +1710,6 @@
       (reset! shapes-loading? false)
       (reset! deferred-render? false)
 
-      ;; TODO: perform corresponding cleaning
-      (set! wasm/context-initialized? false)
       (h/call wasm/internal-module "_clean_up")
 
       ;; Remove event listener for WebGL context lost

frontend/src/app/render_wasm/wasm.cljs

@@ -26,6 +26,9 @@
 (defonce context-initialized? false)
 (defonce context-lost? (atom false))
 
+;; When we're rendering in a sync way we want to stop the asynchrous `request-render`
+(defonce disable-request-render? (atom false))
+
 
 (defonce serializers
   #js {:blur-type shared/RawBlurType

frontend/src/app/worker/thumbnails.cljs

@@ -170,6 +170,7 @@
                                  (render/calculate-dimensions objects thumbnail-aspect-ratio))
                        zoom    (/ width (:width vbox))]
 
+                   (reset! wasm/disable-request-render? true)
                    (wasm.api/initialize-viewport
                     objects zoom vbox
                     :background bgcolor