lok: impress: clear selection when exited the textbox

it was sill visible in other views

Change-Id: I75ce566a17fa1080d6e3008b964e367825225a09
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/140086
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Pranam Lashkari <lpranam@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/141478
Tested-by: Jenkins
Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>

svx/source/svdraw/svdmrkv.cxx

@@ -1117,6 +1117,8 @@ void SdrMarkView::SetMarkHandlesForLOKit(tools::Rectangle const & rRect, const S
         {
             sSelectionText = "EMPTY";
             sSelectionTextView = "EMPTY";
+            if (!pOtherShell)
+                pViewShell->NotifyOtherViews(LOK_CALLBACK_TEXT_VIEW_SELECTION, "selection", OString());
         }
 
         if (bTableSelection)