wxpython, x11: fix browser not resizing on Linux window resize

XConfigureWindow in SetX11WindowBounds was never flushed to the X server,
so the Chrome sub-window stayed at its original size. Add XFlush after the
configure call, and call NotifyMoveOrResizeStarted before SetBounds so CEF
is notified before the resize happens.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: linesight

examples/wxpython.py

@@ -193,7 +193,9 @@ def OnSize(self, _):
         elif LINUX:
             (x, y) = (0, 0)
             (width, height) = self.browser_panel.GetSize().Get()
+            self.browser.NotifyMoveOrResizeStarted()
             self.browser.SetBounds(x, y, width, height)
+            return
         self.browser.NotifyMoveOrResizeStarted()
 
     def OnClose(self, event):

src/client_handler/x11.cpp

@@ -44,6 +44,7 @@ void SetX11WindowBounds(CefRefPtr<CefBrowser> browser,
     changes.height = static_cast<int>(height);
     XConfigureWindow(xdisplay, xwindow,
                      CWX | CWY | CWHeight | CWWidth, &changes);
+    XFlush(xdisplay);
 }
 
 void SetX11WindowTitle(CefRefPtr<CefBrowser> browser, char* title) {