Replay toolbar button events

NOTICE!!!! THIS IS HIGHLY EXPERIMENTAL!

The patch alters the button grab mode to GrabSync
in order to ReplayPointer the event.
THIS CAN FREEZE ANY INPUT TO FLUXBOX!!!

The toolbar (and other things?) grab buttons in order to
handle MouseN events for the entire bar, INCLUDING all child
windows.

This causes two problems:
1. The bar handles events which are not meant for fluxbox at all
   (but the systray icons)
BUG: 940

2. The bar will intercept (and suck) *every* press, even if only
   doubleclicks are desired
BUG: 949

The problem with this patch is that an oversight here has the potential
to completely freeze input event processing in fluxbox (ie. the process
needs to be killed from outside), SO IT NEEDS TESTING!
As much as possible.

src/FbTk/KeyUtil.cc

@@ -144,7 +144,7 @@ void KeyUtil::grabButton(unsigned int button, unsigned int mod, Window win,
     for (int i = 0; i < 8; i++) {
         XGrabButton(display, button, mod | (i & 1 ? LockMask : 0) |
                     (i & 2 ? nummod : 0) | (i & 4 ? scrollmod : 0),
-                    win, False, event_mask, GrabModeAsync, GrabModeAsync,
+                    win, False, event_mask, GrabModeSync, GrabModeAsync,
                     None, cursor);
     }
 

src/SystemTray.cc

@@ -77,6 +77,8 @@ void getScreenCoordinates(Window win, int x, int y, int &screen_x, int &screen_y
 
 };
 
+static SystemTray *s_theoneandonly = 0;
+
 /// helper class for tray windows, so we dont call XDestroyWindow
 class SystemTray::TrayWindow : public FbTk::FbWindow {
 public:
@@ -220,6 +222,8 @@ SystemTray::SystemTray(const FbTk::FbWindow& parent,
     // set owner
     XSetSelectionOwner(disp, tray_atom, m_selection_owner.window(), CurrentTime);
 
+    s_theoneandonly = this;
+
     m_handler.reset(new SystemTrayHandler(*this));
 
     m_handler.get()->setName(atom_name);
@@ -247,6 +251,8 @@ SystemTray::SystemTray(const FbTk::FbWindow& parent,
 
 SystemTray::~SystemTray() {
     // remove us, else fluxbox might delete the memory too
+    if (s_theoneandonly == this)
+        s_theoneandonly = 0;
     Fluxbox* fluxbox = Fluxbox::instance();
     fluxbox->removeAtomHandler(m_handler.get());
     Display *disp = fluxbox->display();
@@ -589,3 +595,10 @@ string SystemTray::getNetSystemTrayAtom(int screen_nr) {
 
     return atom_name;
 }
+
+bool SystemTray::doesControl(Window win) {
+    if (win == None || !s_theoneandonly)
+        return false;
+    return win == s_theoneandonly->window().window() ||
+           s_theoneandonly->findClient(win) != s_theoneandonly->m_clients.end();
+}

src/SystemTray.hh

@@ -87,6 +87,8 @@ public:
 
     static Atom getXEmbedInfoAtom();
 
+    static bool doesControl(Window win);
+
 private:
     void update();
 

src/Toolbar.cc

@@ -31,6 +31,7 @@
 #include "Keys.hh"
 #include "Screen.hh"
 #include "ScreenPlacement.hh"
+#include "SystemTray.hh"
 #include "WindowCmd.hh"
 
 #include "Strut.hh"
@@ -512,14 +513,39 @@ void Toolbar::reconfigure() {
 
 
 void Toolbar::buttonPressEvent(XButtonEvent &be) {
+    Display *dpy = Fluxbox::instance()->display();
+    if (be.subwindow) {
+        // Do not intercept mouse events that are meant for the tray icon
+        if (SystemTray::doesControl(be.subwindow)) {
+            XAllowEvents(dpy, ReplayPointer, CurrentTime);
+            return;
+        }
+#if 0
+        // Unfortunately, the subwindow isn't exactly a reliable source here, so
+        // we COULD query the pointer (what will usually return the systray itself) and
+        // check that as well. NOTICE that due to the async nature of X11, the
+        // pointer might have moved and the result isn't correct either.
+        Window wr, wc; int junk; unsigned int ujunk;
+        XQueryPointer(dpy, be.window, &wr, &wc, &junk, &junk, &junk, &junk, &ujunk);
+        if (SystemTray::doesControl(wc)) {
+            XAllowEvents(dpy, ReplayPointer, CurrentTime);
+            return;
+        }
+#endif
+    }
+
     if (Fluxbox::instance()->keys()->doAction(be.type, be.state, be.button,
-                                              Keys::ON_TOOLBAR, 0, be.time))
+                                              Keys::ON_TOOLBAR, 0, be.time)) {
+        XAllowEvents(dpy, SyncPointer, CurrentTime);
         return;
+    }
 
     if (be.button == 1)
         raise();
-    if (be.button != 2)
+    if (be.button != 2 || be.subwindow) { // only handle direct toolbar MMBs
+        XAllowEvents(dpy, ReplayPointer, CurrentTime);
         return;
+    }
 
     screen()
         .placementStrategy()