Make File-Picker modal on Linux

chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc

Index: chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc b/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
index 249cb664541cd16dd7a7b64ce55b8f3022f33d7c..55e21f231364f4778b29224d450f265bbcfb8628 100644
--- a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
+++ b/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.h"
 
+#include <gdk/gdkx.h>
 #include <gtk/gtk.h>
 #include <stddef.h>
 #include <sys/stat.h>
@@ -32,6 +33,7 @@
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 #include "ui/strings/grit/ui_strings.h"
+#include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 #include "ui/views/widget/desktop_aura/x11_desktop_handler.h"
 
 namespace {
@@ -164,9 +166,11 @@ void SelectFileDialogImplGTK::SelectFileImpl(
 
   params_map_[dialog] = params;
 
-  // TODO(erg): Figure out how to fake GTK window-to-parent modality without
-  // having the parent be a real GtkWindow.
-  gtk_window_set_modal(GTK_WINDOW(dialog), TRUE);
+  // Disable input events handling in the host window to make this dialog modal.
+  views::DesktopWindowTreeHostX11* host =
+      views::DesktopWindowTreeHostX11::GetHostForXID(
+      owning_window->GetHost()->GetAcceleratedWidget());
+  host->DisableEventListening(GDK_WINDOW_XID(gtk_widget_get_window(dialog)));
 
   gtk_widget_show_all(dialog);
 
@@ -425,6 +429,12 @@ void SelectFileDialogImplGTK::FileDialogDestroyed(GtkWidget* dialog) {
   aura::Window* parent = GetAuraTransientParent(dialog);
   if (!parent)
     return;
+

[joone, 2016/01/23 02:52:57]

when the users open a file-picker from a child window of the X11 host window,
parent can be null. As a result, event listening is not enabled again for the
X11 host window.

+  views::DesktopWindowTreeHostX11* host =
+      views::DesktopWindowTreeHostX11::GetHostForXID(
+      parent->GetHost()->GetAcceleratedWidget());
+  host->EnableEventListening();
+
   std::set<aura::Window*>::iterator iter = parents_.find(parent);
   if (iter != parents_.end()) {
     (*iter)->RemoveObserver(this);