fix: do not display "saved" message if some request failed

umap/static/umap/js/modules/sync/engine.js

@@ -225,13 +225,14 @@ export class SyncEngine {
     }
     for (const [obj, operations] of needSave.entries()) {
       const ok = await obj.save()
-      if (!ok) break
+      if (!ok) return false
       for (const operation of operations) {
         operation.dirty = false
       }
     }
     this.saved()
     this._undoManager.toggleState()
+    return true
   }
 
   saved() {

umap/static/umap/js/modules/umap.js

@@ -691,7 +691,8 @@ export default class Umap {
     if (!this.isDirty) return
     if (this._defaultExtent) this._setCenterAndZoom()
     this.backup()
-    await this.sync.save()
+    const status = await this.sync.save()
+    if (!status) return
     // Do a blind render for now, as we are not sure what could
     // have changed, we'll be more subtil when we'll remove the
     // save action