STR #1706: mapping a subwindow with an unmapped parent window would crash under X11.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@5911 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

CHANGES

@@ -3,6 +3,8 @@ CHANGES IN FLTK 1.1.8
 	- Documentation fixes (STR #1454, STR #1455, STR #1456,
 	  STR #1457, STR #1458, STR #1460, STR #1481, STR #1578,
 	  STR #1639, STR #1645, STR #1644)
+	- Fixed mapping of subwindows with unmapped parent
+	  windows (STR #1706)
 	- Fixed rendering of grayscale images with alpha
 	  channel (STR #1703)
 	- Fixed occasional incomplete refresh (STR #1681)

src/Fl_x.cxx

@@ -1134,6 +1134,14 @@ void Fl_X::make_xid(Fl_Window* win, XVisualInfo *visual, Colormap colormap)
     if (Y < scr_y) Y = scr_y;
   }
 
+  // if the window is a subwindow and our parent is not mapped, we
+  // mark this window visible, so that mapping the parent later will
+  // call this function again.
+  if (win->parent() && !Fl_X::i(win->window())) {
+    win->set_visible();
+    return;
+  }
+
   ulong root = win->parent() ?
     fl_xid(win->window()) : RootWindow(fl_display, fl_screen);