Revert "Resolves: tdf#152411 clear before freeze to let gtk a11y ...

... drop reference"

It's no longer needed, since the original problem is solved
differently with Change-Id Id0c241d68ec4fbf933312008f7d0ee86bd3eab0c
("tdf#140659 gtk a11y: Don't unset model when freezing icon view")
in place.

This reverts commit 4e8331b77a2dcad2b10d3ca5b788711ea4e83a1b.

Change-Id: I5c94a1c610a807a09ab62577477135cc14dbcfa6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/148558
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

starmath/source/ElementsDockingWindow.cxx

@@ -574,8 +574,8 @@ void SmElementsControl::setElementSetIndex(int nSetIndex)
 
 void SmElementsControl::addElements(int nCategory)
 {
-    mpIconView->clear(); // tdf#152411 clear before freeze to let gtk a11y drop reference
     mpIconView->freeze();
+    mpIconView->clear();
     mpIconView->set_item_width(0);
     maItemDatas.clear();