File shotwell-tooltip-trigger-coords.patch of Package shotwell

diff --git a/src/CheckerboardLayout.vala b/src/CheckerboardLayout.vala
index c2d1a521..bf6c9151 100644
--- a/src/CheckerboardLayout.vala
+++ b/src/CheckerboardLayout.vala
@@ -2025,7 +2025,14 @@ public class CheckerboardLayout : Gtk.DrawingArea {
     public override bool query_tooltip(int x, int y, bool keyboard_mode, Gtk.Tooltip tooltip) {
         CheckerboardItem? item = get_item_at_pixel(x, y);
         
-        return (item != null) ? item.query_tooltip(x, y, tooltip) : false;
+        // Note: X & Y allocations are relative to parents, so we need to query the item's tooltip
+        // relative to its INTERNAL coordinates, otherwise tooltips don't work
+        if (item != null) {
+            item.translate_coordinates(ref x, ref y);
+            return item.query_tooltip(x, y, tooltip);
+        } else {
+            return false;
+        }
     }
     
     private void on_colors_changed() {
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