1 files changed, 133 insertions, 0 deletions
diff --git a/browser-tabbar-dad-mzbz1527976.patch b/browser-tabbar-dad-mzbz1527976.patch
new file mode 100644
index 0000000..d87d997
--- /dev/null
+++ b/browser-tabbar-dad-mzbz1527976.patch
@@ -0,0 +1,133 @@
+diff --git a/widget/gtk/nsClipboardWayland.cpp b/widget/gtk/nsClipboardWayland.cpp
+--- a/widget/gtk/nsClipboardWayland.cpp
++++ b/widget/gtk/nsClipboardWayland.cpp
+@@ -538,7 +538,6 @@
+   }
+ 
+   LOGDRAG(("nsWindow data_device_enter for GtkWidget %p\n", (void*)gtkWidget));
+-
+   dragContext->DropDataEnter(gtkWidget, time, wl_fixed_to_int(x_fixed),
+                              wl_fixed_to_int(y_fixed));
+ }
+@@ -550,6 +549,8 @@
+   nsWaylandDragContext* dropContext = context->GetDragContext();
+   WindowDragLeaveHandler(dropContext->GetWidget());
+ 
++  LOGDRAG(("nsWindow data_device_leave for GtkWidget %p\n",
++           (void*)dropContext->GetWidget()));
+   context->ClearDragAndDropDataOffer();
+ }
+ 
+@@ -565,6 +566,8 @@
+   nscoord y = wl_fixed_to_int(y_fixed);
+   dropContext->DropMotion(time, x, y);
+ 
++  LOGDRAG(("nsWindow data_device_motion for GtkWidget %p\n",
++           (void*)dropContext->GetWidget()));
+   WindowDragMotionHandler(dropContext->GetWidget(), nullptr, dropContext, x, y,
+                           time);
+ }
+@@ -578,6 +581,8 @@
+   nscoord x, y;
+   dropContext->GetLastDropInfo(&time, &x, &y);
+ 
++  LOGDRAG(("nsWindow data_device_drop GtkWidget %p\n",
++           (void*)dropContext->GetWidget()));
+   WindowDragDropHandler(dropContext->GetWidget(), nullptr, dropContext, x, y,
+                         time);
+ }
+diff --git a/widget/gtk/nsDragService.cpp b/widget/gtk/nsDragService.cpp
+--- a/widget/gtk/nsDragService.cpp
++++ b/widget/gtk/nsDragService.cpp
+@@ -45,6 +45,7 @@
+ #include "nsArrayUtils.h"
+ #ifdef MOZ_WAYLAND
+ #  include "nsClipboardWayland.h"
++#  include "gfxPlatformGtk.h"
+ #endif
+ 
+ using namespace mozilla;
+@@ -59,7 +60,14 @@
+ // directly) so that this code can be compiled against versions of GTK+ that
+ // do not have GtkDragResult.
+ // GtkDragResult is available from GTK+ version 2.12.
+-enum { MOZ_GTK_DRAG_RESULT_SUCCESS, MOZ_GTK_DRAG_RESULT_NO_TARGET };
++enum {
++  MOZ_GTK_DRAG_RESULT_SUCCESS,
++  MOZ_GTK_DRAG_RESULT_NO_TARGET,
++  MOZ_GTK_DRAG_RESULT_USER_CANCELLED,
++  MOZ_GTK_DRAG_RESULT_TIMEOUT_EXPIRED,
++  MOZ_GTK_DRAG_RESULT_GRAB_BROKEN,
++  MOZ_GTK_DRAG_RESULT_ERROR
++};
+ 
+ static LazyLogModule sDragLm("nsDragService");
+ 
+@@ -74,6 +82,7 @@
+ static const char gTextUriListType[] = "text/uri-list";
+ static const char gTextPlainUTF8Type[] = "text/plain;charset=utf-8";
+ static const char gXdndDirectSaveType[] = "XdndDirectSave0";
++static const char gTabDropType[] = "application/x-moz-tabbrowser-tab";
+ 
+ static void invisibleSourceDragBegin(GtkWidget* aWidget,
+                                      GdkDragContext* aContext, gpointer aData);
+@@ -346,12 +355,10 @@
+       gtk_window_get_group(GetGtkWindow(mSourceDocument));
+   gtk_window_group_add_window(window_group, GTK_WINDOW(mHiddenWidget));
+ 
+-#ifdef MOZ_WIDGET_GTK
+   // Get device for event source
+   GdkDisplay* display = gdk_display_get_default();
+   GdkDeviceManager* device_manager = gdk_display_get_device_manager(display);
+   event.button.device = gdk_device_manager_get_client_pointer(device_manager);
+-#endif
+ 
+   // start our drag.
+   GdkDragContext* context =
+@@ -1252,6 +1259,9 @@
+ 
+ void nsDragService::SourceEndDragSession(GdkDragContext* aContext,
+                                          gint aResult) {
++  MOZ_LOG(sDragLm, LogLevel::Debug,
++          ("SourceEndDragSession result %d\n", aResult));
++
+   // this just releases the list of data items that we provide
+   mSourceDataItems = nullptr;
+ 
+@@ -1272,6 +1282,8 @@
+       gint scale = mozilla::widget::ScreenHelperGTK::GetGTKMonitorScaleFactor();
+       gdk_display_get_pointer(display, nullptr, &x, &y, nullptr);
+       SetDragEndPoint(LayoutDeviceIntPoint(x * scale, y * scale));
++      MOZ_LOG(sDragLm, LogLevel::Debug,
++              ("guess drag end point %d %d\n", x * scale, y * scale));
+     }
+   }
+ 
+@@ -1307,7 +1319,25 @@
+   } else {
+     dropEffect = DRAGDROP_ACTION_NONE;
+ 
+-    if (aResult != MOZ_GTK_DRAG_RESULT_NO_TARGET) {
++    bool isWaylandTabDrop = false;
++#ifdef MOZ_WAYLAND
++    // Bug 1527976. Wayland protocol does not have any way how to handle
++    // MOZ_GTK_DRAG_RESULT_NO_TARGET drop result so consider all tab
++    // drops as not cancelled on wayland.
++    if (gfxPlatformGtk::GetPlatform()->IsWaylandDisplay() &&
++        aResult == MOZ_GTK_DRAG_RESULT_ERROR) {
++      for (GList* tmp = gdk_drag_context_list_targets(aContext); tmp;
++           tmp = tmp->next) {
++        GdkAtom atom = GDK_POINTER_TO_ATOM(tmp->data);
++        gchar* name = gdk_atom_name(atom);
++        if (name && (strcmp(name, gTabDropType) == 0)) {
++          isWaylandTabDrop = true;
++          break;
++        }
++      }
++    }
++#endif
++    if (aResult != MOZ_GTK_DRAG_RESULT_NO_TARGET && !isWaylandTabDrop) {
+       mUserCancelled = true;
+     }
+   }
+