[DS-4846] remove selection when selecting single cell

GitOrigin-RevId: 0c12cfa7cb796a3f109d19a54a37235b34a1594e

notebooks/visualization/src/org/jetbrains/plugins/notebooks/visualization/CaretBasedCellSelectionModel.kt

@@ -52,8 +52,10 @@ class CaretBasedCellSelectionModel(private val editor: Editor) : NotebookCellSel
     // carets merging based on visual position
     // can't add another caret "<caret>#%%\n" -> "#%%\n<caret>", in jupyter visual positions are equal (header is hidden).
     // so better to move primary caret instead of adding new. See CellBorderTest.`one cell, click on add cell above`
-    editor.caretModel.primaryCaret.moveToLogicalPosition(cell.startLogicalPosition)
-    editor.caretModel.removeSecondaryCarets()
+    val caretModel = editor.caretModel
+    caretModel.primaryCaret.moveToLogicalPosition(cell.startLogicalPosition)
+    caretModel.primaryCaret.removeSelection()
+    caretModel.removeSecondaryCarets()
   }
 }