fix: track card position in backdrop sourceRect

1 files changed, 5 insertions, 0 deletions

diff --git a/theme/components/Backdrop.qml b/theme/components/Backdrop.qml
index 02c01ac..c13b766 100644
--- a/theme/components/Backdrop.qml
+++ b/theme/components/Backdrop.qml
@@ -24,6 +24,11 @@ Item {
         sourceRect: {
             if (backdrop.sourceItem === null)
                 return Qt.rect(0, 0, 0, 0)
+            // Guard reads: mapToItem() hides its reads in C++, so the binding
+            // would not otherwise re-run when the card or image moves (e.g.
+            // the failed-login shake). Reading the coordinates registers them.
+            var _guard = backdrop.x + backdrop.y + backdrop.parent.x + backdrop.parent.y
+                       + backdrop.sourceItem.x + backdrop.sourceItem.y
             var p = backdrop.mapToItem(backdrop.sourceItem, 0, 0)
             return Qt.rect(p.x, p.y, backdrop.width, backdrop.height)
         }