fix parentrelative background, and some tidying

ChangeLog

@@ -1,5 +1,8 @@
-(Format: Year/Month/Day)
+ (Format: Year/Month/Day)
 Changes for 0.9.16:
+*06/05/22:
+   * Fix handling of ParentRelative background (Simon)
+     FbWindow.cc
 *06/05/21:
    * Fix build on cygwin (iconv const error) (Simon)
      FbTk/FbString.cc

src/FbTk/App.cc

@@ -59,8 +59,7 @@ App::~App() {
 
         Font::shutdown();
         Image::shutdown();
-        FbStringUtil::shutdown();
-        
+
         XCloseDisplay(m_display);
         m_display = 0;
     }

src/FbTk/FbString.cc

@@ -56,10 +56,8 @@ static int iconv_convs[CONVSIZE];
 
 /// Initialise all of the iconv conversion descriptors
 void init() {
-    static bool s_init = false;
-    if (s_init)
+    if (iconv_convs != 0)
         return;
-    s_init = true;
 
     iconv_convs = new iconv_t[CONVSIZE];
 
@@ -92,6 +90,8 @@ void init() {
 }
 
 void shutdown() {
+    if (iconv_convs == 0)
+        return;
 #ifdef HAVE_ICONV
     for (int i=0; i < CONVSIZE; ++i) 
         if (iconv_convs[i] != (iconv_t)(-1))
@@ -99,7 +99,7 @@ void shutdown() {
 #endif // HAVE_ICONV
 
     delete[] iconv_convs;
-
+    iconv_convs = 0;
 }
 
 

src/FbTk/FbWindow.cc

@@ -249,13 +249,19 @@ void FbWindow::setEventMask(long mask) {
 
 void FbWindow::clear() {
     XClearWindow(display(), m_window);
+    if (m_lastbg_pm == ParentRelative && m_renderer)
+        m_renderer->renderForeground(*this, *this);
+
 }
 
 void FbWindow::clearArea(int x, int y,
                          unsigned int width, unsigned int height,
                          bool exposures) {
     // TODO: probably could call renderForeground here (with x,y,w,h)
-    XClearArea(display(), window(), x, y, width, height, exposures);
+    if (m_lastbg_pm == ParentRelative && m_renderer)
+        FbWindow::clear();
+    else
+        XClearArea(display(), window(), x, y, width, height, exposures);
 }
 
 // If override_is_offset, then dest_override is a pixmap located at the_x, the_y

src/main.cc

@@ -303,6 +303,8 @@ int main(int argc, char **argv) {
     if (errbuf != 0)
         cerr.rdbuf(errbuf);
 
+    FbTk::FbStringUtil::shutdown();
+
     if (restarting) {
         const char *arg = restart_argument.c_str();
         if (arg) {