fix: #1181 reset TOC after close the last tab (#1200)

src/renderer/store/editor.js

@@ -59,6 +59,11 @@ const mutations = {
         window.DIRNAME = pathname ? path.dirname(pathname) : ''
         bus.$emit('file-changed', { id, markdown, cursor, renderCursor: true, history })
       }
+      // Handle close the last tab, need to reset the TOC state
+      if (Object.keys(fileState).length === 0) {
+        state.listToc = []
+        state.toc = []
+      }
     }
   },
   // Exchange from with to and move from to the end if to is null or empty.