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White overlay panel on the right side obscures chat text and cannot be revealed by scrolling #13267

Description

@isadamcao

Type: Bug

Environment

OS: macOS 15.7.2
Device: Apple M4
Please fill in: client name / version (app or web), browser (if web)
Summary In the chat view, a white area (blank panel) appears on the right side and covers part of the message text on the left. The hidden text cannot be revealed by scrolling, resizing, or dragging the view in any direction.

Steps to Reproduce

Open a conversation with enough content to require scrolling.
(Adjust the window to a narrow width / or set zoom to XX% — fill in the exact condition that triggers it.)
A white block appears on the right edge, overlapping the text column.
Attempt to scroll horizontally and vertically — the covered text remains hidden.
Expected Behavior All message text should render fully and remain visible; no blank area should overlap the content column. The text should be reachable by normal scrolling.

Actual Behavior A persistent white area covers the right portion of the text. It does not disappear after scrolling or dragging, and the obscured text cannot be brought into view.

Impact Messages become partially unreadable, making the conversation content inaccessible in the affected region.

Attempted Workarounds (no effect)

Scrolling to top and back to bottom
Dragging/resizing the window
Adjusting zoom level

Extension version: 2.0.0
VS Code version: Code 1.137.0 (645f29cc3176500b4b5762ba887cf2a7f0ffdf2c, 2026-09-08T13:43:59-07:00)
OS version: Darwin arm64 24.6.0
Modes:

System Info
Item Value
CPUs Apple M4 (10 x 2400)
GPU Status 2d_canvas: enabled
GPU0: VENDOR= 0x106b [Google Inc. (Apple)], DEVICE=0x0000 [ANGLE (Apple, ANGLE Metal Renderer: Apple M4, Version 15.7.2 (Build 24G325))], DRIVER_VENDOR=Apple, DRIVER_VERSION=15.7.2 ACTIVE
Machine model name: Mac
Machine model version: 16.12
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: enabled_on
trees_in_viz: disabled_off
video_decode: enabled
video_encode: enabled
webgl: enabled
webgpu: enabled
webnn: disabled_off
Load (avg) 2, 2, 3
Memory (System) 16.00GB (0.32GB free)
Process Argv --crash-reporter-id 1fcd1e69-db28-4c4d-9586-36aa938d3fb6
Screen Reader no
VM 0%
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