work around editor freeze issue after external drag & drop

qt/aqt/editor.py

@@ -917,8 +917,13 @@ to a cloze type first, via 'Notes>Change Note Type'"""
         )
 
     def doDrop(self, html, internal):
+        def pasteIfField(ret):
+            if ret:
+                self.doPaste(html, internal)
+
+        p = self.web.mapFromGlobal(QCursor.pos())
         self.web.evalWithCallback(
-            "makeDropTargetCurrent();", lambda _: self.doPaste(html, internal)
+            f"focusIfField(document.elementFromPoint({p.x()}, {p.y()}));", pasteIfField
         )
 
     def onPaste(self):
@@ -1037,6 +1042,9 @@ class EditorWebView(AnkiWebView):
     def onMiddleClickPaste(self) -> None:
         self._onPaste(QClipboard.Selection)
 
+    def dragEnterEvent(self, evt):
+        evt.accept()
+
     def dropEvent(self, evt):
         mime = evt.mimeData()
 

qt/ts/src/editor.ts

@@ -1,11 +1,8 @@
 /* Copyright: Ankitects Pty Ltd and contributors
  * License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html */
 
-import DragOverEvent = JQuery.DragOverEvent;
-
 let currentField = null;
 let changeTimer = null;
-let dropTarget = null;
 let currentNoteId = null;
 
 declare interface String {
@@ -219,20 +216,15 @@ function focusPrevious() {
     }
 }
 
-function onDragOver(elem) {
-    const e = (window.event as unknown) as DragOverEvent;
-    //e.dataTransfer.dropEffect = "copy";
-    e.preventDefault();
-    // if we focus the target element immediately, the drag&drop turns into a
-    // copy, so note it down for later instead
-    dropTarget = elem;
-}
-
-function makeDropTargetCurrent() {
-    dropTarget.focus();
-    // the focus event may not fire if the window is not active, so make sure
-    // the current field is set
-    currentField = dropTarget;
+function focusIfField(elem) {
+    if (elem.classList.contains("field")) {
+        elem.focus();
+        // the focus event may not fire if the window is not active, so make sure
+        // the current field is set
+        currentField = elem;
+        return true;
+    }
+    return false;
 }
 
 function onPaste(elem) {
@@ -366,7 +358,6 @@ function setFields(fields) {
                      onfocus='onFocus(this);'
                      onblur='onBlur();'
                      class='field clearfix'
-                     ondragover='onDragOver(this);'
                      onpaste='onPaste(this);'
                      oncopy='onCutOrCopy(this);'
                      oncut='onCutOrCopy(this);'