Fix broken _NET_REQUEST_FRAME_EXTENTS support

There was a subtle flaw in the way fluxbox detects to which BScreen a
given Window belongs: We have to compare the RootWindow of the given
Window against the RootWindow of each BScreen.

That underlying flaw made _NET_REQUEST_FRAME_EXTENTS fail: the code path
needs a valid BScreen for the given window, otherwise we return early.

Closes #1121.

1 files changed, 9 insertions, 6 deletions

diff --git a/src/FbTk/FbWindow.cc b/src/FbTk/FbWindow.cc
index 1930d4e..357a26f 100644
--- a/src/FbTk/FbWindow.cc
+++ b/src/FbTk/FbWindow.cc
@@ -31,16 +31,19 @@
 #include <X11/Xutil.h>
 #include <X11/Xatom.h>
 
-#ifdef HAVE_CASSERT
-  #include <cassert>
-#else
-  #include <assert.h>
-#endif
-
+#include <cassert>
 #include <limits>
 
 namespace FbTk {
 
+Window FbWindow::rootWindow(Display* dpy, Drawable win) {
+    union { int i; unsigned int ui; } ignore;
+    Window root = None;
+    XGetGeometry(dpy, win, &root, &ignore.i, &ignore.i, &ignore.ui, &ignore.ui, &ignore.ui, &ignore.ui);
+    return root;
+}
+
+
 FbWindow::FbWindow():
     FbDrawable(),
     m_parent(0), m_screen_num(0), m_window(0),