fix: add icons to EditorTree and optimize its style (#656)

Author: kiwiwong

src/workbench/sidebar/explore/editorTree.tsx

@@ -251,7 +251,7 @@ const EditorTree = (props: IOpenEditProps) => {
                                             className={
                                                 editorTreeFileIconClassName
                                             }
-                                            type={file.data?.icon || ''}
+                                            type={file.data?.icon || file.icon}
                                         />
                                         <span
                                             className={

src/workbench/sidebar/explore/style.scss

@@ -163,10 +163,9 @@
 
     &__file[class*='codicon-'] {
         flex-shrink: 0;
-        font-size: inherit;
         height: 22px;
         line-height: 23px;
-        margin: 0 2px;
+        margin: 0 5px 0 3px;
         width: 16px;
     }
 }