search match case not working for notebooks

[stephenfrost]

Type: Bug

When I type a word in all caps in the search field of the search pane and enable the "match case" option, the results still include lower case occurrences within .ipynb notebooks (in my case, within input cells of the notebooks).

VS Code version: Code 1.81.1 (6c3e3db, 2023-08-09T22:22:42.175Z)
OS version: Windows_NT x64 10.0.19045
Modes:
Remote OS version: Linux x64 4.18.0-477.15.1.el8_8.x86_64

[andreamah]

related: #191571