input: abord dnd op on escape pressed

ref #9154

src/protocols/core/DataDevice.cpp

@@ -814,3 +814,9 @@ void CWLDataDeviceProtocol::renderDND(PHLMONITOR pMonitor, timespec* when) {
 bool CWLDataDeviceProtocol::dndActive() {
     return dnd.currentSource;
 }
+
+void CWLDataDeviceProtocol::abortDndIfPresent() {
+    if (!dndActive())
+        return;
+    abortDrag();
+}

src/protocols/core/DataDevice.hpp

@@ -144,6 +144,9 @@ class CWLDataDeviceProtocol : public IWaylandProtocol {
     // TODO: move handling to seatmgr
     bool dndActive();
 
+    // called on an escape key pressed, for moments where it gets stuck
+    void abortDndIfPresent();
+
   private:
     void destroyResource(CWLDataDeviceManagerResource* resource);
     void destroyResource(CWLDataDeviceResource* resource);