tdf#100370 Selection icon now working properly on mouse click

Change-Id: I45786ab3eb0b93d2f987d83156011b768869a414
Reviewed-on: https://gerrit.libreoffice.org/48279Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

svx/source/stbctrls/selctrl.cxx

@@ -107,7 +107,7 @@ bool SvxSelectionModeControl::MouseButtonDown( const MouseEvent& rEvt )
     SelectionTypePopup aPop(mnState);
     StatusBar& rStatusbar = GetStatusBar();
 
-    if (aPop.Execute(&rStatusbar, rEvt.GetPosPixel()))
+    if (rEvt.IsMiddle() && aPop.Execute(&rStatusbar, rEvt.GetPosPixel()))
     {
         sal_uInt16 nNewState = aPop.GetState();
         if ( nNewState != mnState )