tdf#104086 cui: enable OpenGL when ignoring its blacklist

"Ignore OpenGL blacklist" is called "force OpenGL" in the code, so it
make sense that OpenGLHelper::isVCLOpenGLEnabled() returns true in that
case. But the UI suggested that enabling ignore doesn't enable OpenGL
itself.

Fix this by auto-checking the parent UI widget when enabling the
blacklist.

Change-Id: I16bec69aebd645858260850f15ea8e687566fd0e
Reviewed-on: https://gerrit.libreoffice.org/54720Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>

cui/source/options/optgdlg.cxx

@@ -659,6 +659,8 @@ OfaViewTabPage::OfaViewTabPage(vcl::Window* pParent, const SfxItemSet& rSet)
 
 #endif
 
+    m_pForceOpenGL->SetToggleHdl(LINK(this, OfaViewTabPage, OnForceOpenGLToggled));
+
     // Set known icon themes
     OUString sAutoStr( m_pIconStyleLB->GetEntry( 0 ) );
     m_pIconStyleLB->Clear();
@@ -736,6 +738,13 @@ IMPL_LINK_NOARG( OfaViewTabPage, OnAntialiasingToggled, CheckBox&, void )
 }
 #endif
 
+IMPL_LINK_NOARG(OfaViewTabPage, OnForceOpenGLToggled, CheckBox&, void)
+{
+    if (m_pForceOpenGL->IsChecked())
+        // Ignoring the opengl blacklist implies that opengl is on.
+        m_pUseOpenGL->Check();
+}
+
 VclPtr<SfxTabPage> OfaViewTabPage::Create( TabPageParent pParent, const SfxItemSet* rAttrSet )
 {
     return VclPtr<OfaViewTabPage>::Create(pParent.pParent, *rAttrSet);

cui/source/options/optgdlg.hxx

@@ -121,6 +121,7 @@ private:
 #if defined( UNX )
     DECL_LINK( OnAntialiasingToggled, CheckBox&, void );
 #endif
+    DECL_LINK(OnForceOpenGLToggled, CheckBox&, void);
     void UpdateOGLStatus();
 
 public: