Fix jumping Scroller (#2305)

Signed-off-by: Alexander Platov <sas_lord@mail.ru>

packages/core/src/lang/ru.json

@@ -27,4 +27,4 @@
     "Enum": "Справочник",
     "Members": "Участники"
   }
-}
+}

packages/ui/src/components/Scroller.svelte

@@ -13,7 +13,7 @@
 // limitations under the License.
 -->
 <script lang="ts">
-  import { onDestroy, onMount } from 'svelte'
+  import { beforeUpdate, afterUpdate, onDestroy, onMount } from 'svelte'
   import { resizeObserver } from '../resize'
   import { themeStore as themeOptions } from '@hcengineering/theme'
   import type { FadeOptions } from '../types'
@@ -203,6 +203,16 @@
     if (divScroll) divScroll.removeEventListener('scroll', checkFade)
   })
 
+  let oldTop: number
+  beforeUpdate(() => {
+    if (divBox && divScroll) oldTop = divScroll.scrollTop
+  })
+  afterUpdate(() => {
+    if (divBox && divScroll) {
+      if (oldTop !== divScroll.scrollTop) divScroll.scrollTop = oldTop
+    }
+  })
+
   let divHeight: number
   const _resize = (): void => checkFade()