Resolves: tdf#144783 shift+RETURN not searching backwards

In gtk nothing is happening, in gen its searching forwards.  Align
backends so that Activate is emitted only on a bare return in both and
then handle shift+RETURN explicitly for the search widget

Change-Id: I142002bbaf6b3aca83800a442096a4b1024fe097
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/122748
Tested-by: Jenkins
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
diff --git a/svx/source/tbxctrls/tbunosearchcontrollers.cxx b/svx/source/tbxctrls/tbunosearchcontrollers.cxx
index eebb536..4156e74 100644
--- a/svx/source/tbxctrls/tbunosearchcontrollers.cxx
+++ b/svx/source/tbxctrls/tbunosearchcontrollers.cxx
@@ -298,8 +298,8 @@ IMPL_LINK(FindTextFieldControl, KeyInputHdl, const KeyEvent&, rKeyEvent, bool)
    else if ( bMod1 && nCode == KEY_F )
        m_xWidget->select_entry_region(0, -1);

    // Execute the search when Ctrl-G or F3 pressed (in addition to ActivateHdl conditions)
    else if ( (bMod1 && (KEY_G == nCode)) || (KEY_F3 == nCode) )
    // Execute the search when Ctrl-G, F3 and Shift-RETURN pressed (in addition to ActivateHdl condition which handles bare RETURN)
    else if ( (bMod1 && KEY_G == nCode) || (bShift && KEY_RETURN == nCode) || (KEY_F3 == nCode) )
    {
        ActivateFind(bShift);
        bRet = true;
diff --git a/vcl/source/control/edit.cxx b/vcl/source/control/edit.cxx
index f5bf3c4..f3fcf87 100644
--- a/vcl/source/control/edit.cxx
+++ b/vcl/source/control/edit.cxx
@@ -1675,10 +1675,8 @@ bool Edit::ImplHandleKeyEvent( const KeyEvent& rKEvt )
            break;

            case KEY_RETURN:
                if (maActivateHdl.IsSet())
                {
                if (maActivateHdl.IsSet() && !rKEvt.GetKeyCode().GetModifier())
                    bDone = maActivateHdl.Call(*this);
                }
            break;

            default: