اصلاح قابلیت مقایسه شماتیک

frontend/compare.js

@@ -78,7 +78,12 @@ async function start(){
   for(const element of [filter,document.querySelector('#only-changes'),document.querySelector('#highlights')])element.addEventListener('change',applyFilters);
   document.querySelector('#fit').addEventListener('click',()=>{for(const view of views)view.fit();});
   document.querySelector('#sync').addEventListener('change',()=>{if(document.querySelector('#sync').checked&&views[0])views[1].apply(views[0].pose());});
-  function next(delta){const candidates=visibleChanges();if(!candidates.length)return;const index=candidates.findIndex(c=>c.id===selected);select(candidates[(index+delta+candidates.length)%candidates.length]);}
+  function next(delta){
+    const candidates=visibleChanges();if(!candidates.length)return;
+    const index=candidates.findIndex(c=>c.id===selected);
+    const target=index<0?(delta>0?0:candidates.length-1):(index+delta+candidates.length)%candidates.length;
+    select(candidates[target]);
+  }
   document.querySelector('#previous').addEventListener('click',()=>next(-1));document.querySelector('#next').addEventListener('click',()=>next(1));
   for(const svg of svgs)svg.addEventListener('click',event=>{const id=event.target.closest('[data-change-id]')?.dataset.changeId;if(byId.has(id))select(byId.get(id));});
   applyFilters();