fix m_background_loaded

ChangeLog

@@ -1,5 +1,9 @@
  (Format: Year/Month/Day)
 Changes for 1.0rc3:
+*06/07/25:
+   * Fix background style item so that it works when the previous style
+     didn't have one set (Mark)
+     Screen.cc RootTheme.hh
 *06/07/23:
    * Use a timer to make sure focus always reverts if possible (Mark)
      fluxbox.cc/hh and reverse patch from 06/07/20

src/RootTheme.hh

@@ -51,6 +51,7 @@ public:
 
     bool fallback(FbTk::ThemeItem_base &item);
     void reconfigTheme();
+    void setLoaded() { m_background_loaded = true; }
 
     GC opGC() const { return m_opgc.gc(); }
 

src/Screen.cc

@@ -884,6 +884,8 @@ void BScreen::reconfigure() {
     // notify objects that the screen is reconfigured
     m_reconfigure_sig.notify();
 
+    m_root_theme->setLoaded();
+
     // Reload style
     FbTk::ThemeManager::instance().load(fluxbox->getStyleFilename(),
                                         fluxbox->getStyleOverlayFilename(),