patch 8.1.1597: cannot scroll a popup window with the mouse
Problem: Cannot scroll a popup window with the mouse.
Solution: If the popup window has a scrollbar let the mouse scroll wheel
scroll the window.
diff --git a/src/testdir/dumps/Test_popupwin_firstline.dump b/src/testdir/dumps/Test_popupwin_firstline.dump
index 7efcf3e..1371297 100644
--- a/src/testdir/dumps/Test_popupwin_firstline.dump
+++ b/src/testdir/dumps/Test_popupwin_firstline.dump
@@ -3,7 +3,7 @@
|3| @73
|4| @33|3+0#0000001#ffd7ff255@4| +0#0000000#a8a8a8255| +0&#ffffff0@33
|5| @33|4+0#0000001#ffd7ff255@1| @2| +0#0000000#0000001| +0&#ffffff0@33
-|6| @33|5+0#0000001#ffd7ff255| @3| +0#0000000#a8a8a8255| +0&#ffffff0@33
+|6| @33|5+0#0000001#ffd7ff255| @3| +0#0000000#0000001| +0&#ffffff0@33
|7| @33|6+0#0000001#ffd7ff255@4| +0#0000000#a8a8a8255| +0&#ffffff0@33
|8| @73
|9| @73