prioritize html over images to fix MS issue (#449)

this means that copying&pasting images on linux/firefox will redownload the
image which is wasteful, but Windows users make up the majority of the
userbase

aqt/editor.py

@@ -1042,14 +1042,14 @@ class EditorWebView(AnkiWebView):
         # print "html", mime.html()
         # print "urls", mime.urls()
         # print "text", mime.text()
-        if mime.hasImage():
-            return self._processImage(mime)
-        elif mime.hasUrls():
+        if mime.hasUrls():
             return self._processUrls(mime)
         elif mime.hasText() and (self.strip or not mime.hasHtml()):
             return self._processText(mime)
         elif mime.hasHtml():
             return self._processHtml(mime)
+        elif mime.hasImage():
+            return self._processImage(mime)
         else:
             # nothing
             return QMimeData()