Add puglX11GrabFocus as a safer way to grab focus on X11

Signed-off-by: falkTX <falktx@falktx.com>

dgl/src/WindowPrivateData.cpp

@@ -363,7 +363,7 @@ void Window::PrivateData::focus()
     if (! isEmbed)
         puglRaiseWindow(view);
 
-    puglGrabFocus(view);
+    puglX11GrabFocus(view);
 }
 
 // -----------------------------------------------------------------------

dgl/src/pugl.cpp

@@ -506,6 +506,28 @@ void puglWin32SetWindowResizable(PuglView* const view, const bool resizable)
 #endif
 
 #ifdef HAVE_X11
+// --------------------------------------------------------------------------------------------------------------------
+// X11 specific, safer way to grab focus
+
+PuglStatus puglX11GrabFocus(PuglView* const view)
+{
+    PuglInternals* const impl = view->impl;
+
+    XWindowAttributes wa;
+    std::memset(&wa, 0, sizeof(wa));
+
+    DISTRHO_SAFE_ASSERT_RETURN(XGetWindowAttributes(impl->display, impl->win, &wa), PUGL_UNKNOWN_ERROR);
+
+    if (wa.map_state == IsViewable)
+    {
+        XRaiseWindow(impl->display, impl->win);
+        XSetInputFocus(impl->display, impl->win, RevertToPointerRoot, CurrentTime);
+        XSync(impl->display, False);
+    }
+
+    return PUGL_SUCCESS;
+}
+
 // --------------------------------------------------------------------------------------------------------------------
 // X11 specific, setup event loop filter for sofd file dialog
 

dgl/src/pugl.hpp

@@ -120,6 +120,10 @@ puglWin32SetWindowResizable(PuglView* view, bool resizable);
 #endif
 
 #ifdef HAVE_X11
+// X11 specific, safer way to grab focus
+PUGL_API PuglStatus
+puglX11GrabFocus(PuglView* view);
+
 // X11 specific, setup event loop filter for sofd file dialog
 PUGL_API void
 sofdFileDialogSetup(PuglWorld* world);