Scrolling in Source Control stops when cursor hits a text box

[poshcodebear]

Issue Type: Bug

With the new combined source control panel, if you have a long list of repos and changes that causes the pane to have a scroll bar, if you scroll down and your mouse cursor hits a text box, you won't be able to scroll further. This is especially pronounced if you move the source control to the bottom pane and have several changes across different repos.

I ran across this using my touchpad mouse and using two-finger scrolling; I've not tested it yet on a mouse wheel (I don't have one on the system I'm writing this on but I'll test it when I switch systems later today).

Easy way to replicate:

• Load a folder with several source controlled repositories (or workspace with the same)
• Make and save changes so source control will have a few uncommitted changes and display the text entry boxes for commit messages
• If the source control text isn't long enough to cause it to get a scroll bar, either resize the window until the window is small enough or move the source control into the bottom panel (this works well because of the very limited vertical space causes you to need to scroll much sooner)
• Scroll until your mouse is hovering over one of the text entry fields
• Continue attempting to scroll

Expected behavior:
The pane will continue scrolling

Actual behavior:
The pane will no longer allow you to scroll until you move your mouse outside of the text box

VS Code version: Code 1.47.0 (d5e9aa0, 2020-07-09T08:02:06.629Z)
OS version: Windows_NT x64 10.0.18363

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz (8 x 3392)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: unavailable_off protected_video_decode: unavailable_off rasterization: unavailable_off skia_renderer: disabled_off_ok video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off_ok webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	15.89GB (7.27GB free)
Process Argv
Screen Reader	no
VM	0%

Extensions (not applicable)

Note: I've left out the extensions as I've replicated this issue with all extensions disabled as well.

[poshcodebear]

I've verified that this also affects a regular mouse with a mouse wheel for scrolling. I also checked Linux and it happens there as well.