Resolves: fdo#58998 insert section applied twice

regression since 0157f0b1

my belief was that OK_Impl was only called in one
place, in sw/source/ui/fmtui/tmpdlg.cxx, so I
merged the use there into OK_Impl, but of course
there was another use in sfx2/source/dialog/tabdlg.cxx

Given that OK_Impl only called PrepareLeaveCurrentPage originally...

a) replace OK_Impl in sfx2/source/dialog/tabdlg.cxx
with PrepareLeaveCurrentPage, a no-op from the original state.
b) add an Apply method that does what I want, i.e.
call ok without closing the dialog, so we can retain
the fix of fdo#38606 to have "apply" immediately
apply the effect of pressing "ok" without closing
and reopening the dialog

Change-Id: I57e2e41c07ab9bf89ada98d1b9c3336db3493f19

sfx2/inc/sfx2/tabdlg.hxx

@@ -219,13 +219,9 @@ public:
     void                SetApplyHandler(const Link& _rHdl);
 
     SAL_DLLPRIVATE void Start_Impl();
-    bool OK_Impl()
-    {
-        bool bRet = PrepareLeaveCurrentPage();
-        if (bRet)
-            Ok();
-        return bRet;
-    }
+
+    //calls Ok without closing dialog
+    bool Apply();
 };
 
 namespace sfx { class ItemConnectionBase; }

sfx2/source/dialog/tabdlg.cxx

@@ -1175,7 +1175,7 @@ IMPL_LINK_NOARG(SfxTabDialog, OkHdl)
 {
     pImpl->bInOK = sal_True;
 
-    if ( OK_Impl() )
+    if (PrepareLeaveCurrentPage())
     {
         if ( pImpl->bModal )
             EndDialog( Ok() );
@@ -1188,6 +1188,14 @@ IMPL_LINK_NOARG(SfxTabDialog, OkHdl)
     return 0;
 }
 
+bool SfxTabDialog::Apply()
+{
+    bool bApplied = false;
+    if (PrepareLeaveCurrentPage())
+         bApplied = (Ok() == RET_OK);
+    return bApplied;
+}
+
 // -----------------------------------------------------------------------
 
 bool SfxTabDialog::PrepareLeaveCurrentPage()

sw/source/ui/dialog/swdlgfact.cxx

@@ -159,7 +159,7 @@ String AbstractTabDialog_Impl::GetText() const
 
 IMPL_LINK_NOARG(AbstractApplyTabDialog_Impl, ApplyHdl)
 {
-    if (pDlg->OK_Impl())
+    if (pDlg->Apply())
         m_aHandler.Call(NULL);
     return 0;
 }