[Accessibility] Use aria-live instead of auto synth for Chat response to typed query

[jooyoungseo]

Type: Bug

CC @meganrogge

Currently, auto synth read-aloud is used universally in Chat for both voice and manual query when screen reader mode is on whereas non-SR users hear the auto synth only when the voice query is used:

{
  "editor.accessibilitySupport": "on",
  "accessibility.voice.autoSynthesize": "on",
}

Please disable auto synth read-aloud and use aria-live for manual query for SR users. This is because SR users may want to intentionally (and selectively) use the auto synth read-aloud just like sighted users. Non-SR users may easily think that the auto synth read-aloud and aria-live provide the same result; however, that's not the case. SR's TTS is a more customized speech output (e.g., rate; volume; voice color) while the auto synth read-aloud is a factory (less configurable) output. We have to carefully avoid any overgeneralization under a simple assumption that the two methods share the same audio modality. Based on my experience over the past couple of days, I feel like using aria-live for manual query and auto synth read-aloud for voice query has been more preferrable and offered a more pleasant experience.

VS Code version: Code - Insiders 1.94.0-insider (8d1bb84, 2024-09-19T05:04:09.996Z)
OS version: Windows_NT x64 10.0.22631
Modes:

System Info

Item	Value
CPUs	11th Gen Intel(R) Core(TM) i5-1145G7 @ 2.60GHz (8 x 2611)
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: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	15.71GB (4.57GB free)
Process Argv	--crash-reporter-id b05b88e5-8894-4031-ae34-fa034ebddea9
Screen Reader	yes
VM	0%

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(1 theme extensions excluded)

A/B Experiments

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[meganrogge]

@jooyoungseo I made this change because you suggested it #227832 (comment)

Thanks for testing it out, I'll revert this.