bpo-37902: IDLE: Add scrolling for IDLE browsers. (#15368)

Modify the wheel event handler so it can also be used for module, path, and stack browsers.
Patch by George Zhang.
diff --git a/Misc/ACKS b/Misc/ACKS
index ce8b144..ce427b8 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1871,6 +1871,7 @@
 Yuxiao Zeng
 Uwe Zessin
 Cheng Zhang
+George Zhang
 Kai Zhu
 Tarek Ziadé
 Jelle Zijlstra
diff --git a/Misc/NEWS.d/next/IDLE/2019-08-21-16-02-49.bpo-37902._R_adE.rst b/Misc/NEWS.d/next/IDLE/2019-08-21-16-02-49.bpo-37902._R_adE.rst
new file mode 100644
index 0000000..24b4142
--- /dev/null
+++ b/Misc/NEWS.d/next/IDLE/2019-08-21-16-02-49.bpo-37902._R_adE.rst
@@ -0,0 +1,2 @@
+Add mousewheel scrolling for IDLE module, path, and stack browsers.
+Patch by George Zhang.