Files changed doesn't properly reflect changes against non base branch

[lramos15]

Type: Bug

Using the VS Code repo as reference

1. Create a branch off the release branch such as release/1.85
2. Make some changes
3. Create a PR
4. 🐛 The files changed view shows a ton of changes diffing between main and your branch rather than the proper base.
5. Create PR and realize only your files changed

Extension version: 0.79.2023121209
VS Code version: Code - Insiders 1.86.0-insider (Universal) (72cb92fdc5d08101d65d59e4b1c046d397896dd2, 2023-12-12T05:37:56.079Z)
OS version: Darwin x64 23.1.0
Modes:

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-1068NG7 CPU @ 2.30GHz (8 x 2300)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: disabled_off 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 webgl: enabled webgl2: enabled webgpu: enabled
Load (avg)	4, 4, 4
Memory (System)	32.00GB (7.79GB free)
Process Argv	--crash-reporter-id 7170f6db-7270-442f-945e-4508c02991d4
Screen Reader	no
VM	0%

A/B Experiments

vsliv695:30137379
vsins829:30139715
vsliv368cf:30146710
vsreu685:30147344
python383cf:30185419
vspor879:30202332
vspor708:30202333
vspor363:30204092
vslsvsres303:30308271
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vsc_aacf:30263846
pythonptprofiler:30281269
vshan820:30294714
vscod805cf:30301675
bridge0708:30335490
bridge0723:30353136
vsaa593:30376534
pythonvs932:30404738
py29gd2263:30784851
vsclangdf:30492506
c4g48928:30535728
dsvsc012cf:30540253
showlangstatbar:30737417
fixshowwlkth:30771523
showindicator:30805243
pythongtdpath:30726887
i26e3531:30792625
welcomedialog:30812478
pythonnosmt12:30779711
pythonidxpt:30768918
pythonnoceb:30776497
asynctok:30898717
dsvsc013:30777762
dsvsc014:30777825
pythonmpswarning:30901777
dsvsc015:30821418
pythontestfixt:30866404
pythonregdiag2:30902439
pyreplss1:30879911
pythonmypyd1:30859725
pythoncet0:30859736
pythontbext0:30879054
accentitlementst:30870582
dsvsc016:30879898
dsvsc017:30880771
dsvsc018:30880772
aa_t_chat:30882232

[alexr00]

Caused by the refactor I did to support the Copilot sparkle action.

[lramos15]

This bug seems back

[alexr00]

I'm not able to repro this. If you see it again, can you switch to the git SCM view, hit refresh, and see if that resolves it?

[lramos15]

That does not resolve it

[alexr00]

@lramos15 I found a place where I left out a model update from a bad merge last week. Do you still see this? If so, what is githubPullRequests.createDefaultBaseBranch set to and are you creating the PR from desktop?