UX: Markdown preview scrollbar doesn't reach the edge of the screen

[codingthat]

Type: Bug

In a regular code window having a vertical scrollbar, if you use Fitz' law and fling your mouse to the right edge of the screen, you can drag the scrollbar without having to precisely target it.

Not so in a Mardown preview window. Here, you have to backtrack a few pixels to use the scrollbar (which is skinnier than on regular windows for some reason), requiring finnicky precision and detracting quite a bit from ease-of-use.

Steps:

1. Open a code window and a Markdown preview window.
2. Compare scrollbar behavior.
3. I'd expect the Markdown preview window to behave like the code window.

VSCodium version: VSCodium 1.96.2 (29b115fb6fb418b80e93102cb177e06803e7b907, 2024-12-21T00:45:47.611Z)
OS version: Linux x64 5.15.0-130-generic
Modes:

System Info

Item	Value
CPUs	11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz (16 x 1181)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off webnn: disabled_off
Load (avg)	5, 2, 1
Memory (System)	15.36GB (8.22GB free)
Process Argv	--new-window
Screen Reader	no
VM	0%
DESKTOP_SESSION	mate
XDG_CURRENT_DESKTOP	MATE
XDG_SESSION_DESKTOP	mate
XDG_SESSION_TYPE	x11

Extensions (4)

Extension	Author (truncated)	Version
Bookmarks	ale	13.0.1
elixir-ls	eli	0.26.2
beautify	Hoo	1.4.11
subtitles-editor	pep	1.1.7