Not being case sensitive to files resulted in the correct dependency not being found.

Environment

• OS and version: Windows 11 22H2 22621.2428
• VS Code: 1.83.1
• C/C++ extension: v1.17.5

Bug Summary and Steps to Reproduce

Bug Summary:

demo: https://github.com/wc7086/cppextdemo

Steps to reproduce:

1. Open my demo project
2. Building with platformio

Debugger Configurations

// AUTOMATICALLY GENERATED FILE. PLEASE DO NOT MODIFY IT MANUALLY
//
// PIO Unified Debugger
//
// Documentation: https://docs.platformio.org/page/plus/debugging.html
// Configuration: https://docs.platformio.org/page/projectconf/section_env_debug.html

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "platformio-debug",
            "request": "launch",
            "name": "PIO Debug",
            "executable": "C:/Users/*/Desktop/code/demo/demo/.pio/build/esp12e/firmware.elf",
            "projectEnvName": "esp12e",
            "toolchainBinDir": "C:/Users/*/.platformio/packages/toolchain-xtensa/bin",
            "internalConsoleOptions": "openOnSessionStart",
            "preLaunchTask": {
                "type": "PlatformIO",
                "task": "Pre-Debug"
            }
        },
        {
            "type": "platformio-debug",
            "request": "launch",
            "name": "PIO Debug (skip Pre-Debug)",
            "executable": "C:/Users/*/Desktop/code/demo/demo/.pio/build/esp12e/firmware.elf",
            "projectEnvName": "esp12e",
            "toolchainBinDir": "C:/Users/*/.platformio/packages/toolchain-xtensa/bin",
            "internalConsoleOptions": "openOnSessionStart"
        },
        {
            "type": "platformio-debug",
            "request": "launch",
            "name": "PIO Debug (without uploading)",
            "executable": "C:/Users/*/Desktop/code/demo/demo/.pio/build/esp12e/firmware.elf",
            "projectEnvName": "esp12e",
            "toolchainBinDir": "C:/Users/*/.platformio/packages/toolchain-xtensa/bin",
            "internalConsoleOptions": "openOnSessionStart",
            "loadMode": "manual"
        }
    ]
}

Debugger Logs

Processing esp12e (platform: espressif8266; board: esp12e; framework: arduino)
----------------------------------------------------------------------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/espressif8266/esp12e.html
PLATFORM: Espressif 8266 (4.2.1) > Espressif ESP8266 ESP-12E
HARDWARE: ESP8266 80MHz, 80KB RAM, 4MB Flash
PACKAGES: 
 - framework-arduinoespressif8266 @ 3.30102.0 (3.1.2) 
 - tool-esptool @ 1.413.0 (4.13) 
 - tool-esptoolpy @ 1.30000.201119 (3.0.0) 
 - toolchain-xtensa @ 2.100300.220621 (10.3.0)
LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 37 compatible libraries
Scanning dependencies...
No dependencies
Building in release mode
Compiling .pio\build\esp12e\src\eeprom.cpp.o
src\eeprom.cpp: In function 'void begin()':
src\eeprom.cpp:3:16: error: 'EEPROM' was not declared in this scope
    3 | void begin() { EEPROM.begin(4095); }
      |                ^~~~~~
src\eeprom.cpp: In function 'void end()':
src\eeprom.cpp:5:14: error: 'EEPROM' was not declared in this scope
    5 | void end() { EEPROM.end(); }
      |              ^~~~~~
Compiling .pio\build\esp12e\FrameworkArduino\FS.cpp.o
Compiling .pio\build\esp12e\FrameworkArduino\FSnoop.cpp.o
Compiling .pio\build\esp12e\FrameworkArduino\FunctionalInterrupt.cpp.o
Compiling .pio\build\esp12e\FrameworkArduino\HardwareSerial.cpp.o
Compiling .pio\build\esp12e\FrameworkArduino\IPAddress.cpp.o
Compiling .pio\build\esp12e\FrameworkArduino\LwipDhcpServer-NonOS.cpp.o
*** [.pio\build\esp12e\src\eeprom.cpp.o] Error 1
Compiling .pio\build\esp12e\FrameworkArduino\LwipDhcpServer.cpp.o
========================================================= [FAILED] Took 2.04 seconds =========================================================

Other Extensions

No response

Additional Information

Holding down the ctrl key and clicking on #include "eeprom.h" and #include <EEPROM.h> both go to eeprom.h, but clicking on the EEPROM class goes to EEPROM.h normally.

Reproduce the failure by opening the linked demo project and building it with PlatformIO. Compare resolution of the lowercase eeprom.h include with the uppercase EEPROM.h file and the reported EEPROM compile errors. Done means the correct dependency is found without confusing the two filenames and the demo build succeeds.