Custom splash screen PNG file will not show when the PNG have alpha channel

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System Information

Windows 11

LMMS Version(s)

1.3.0 alpha and later

Most Recent Working Version

Not sure, but I remember is 1.2.2

Bug Summary

When making a new theme, the splash screen PNG file (splash.png) will not be rendered if the image have transparency on it
It is similar to #4511

Expected Behaviour

lmms should load splash.png on start up regardless of if there is transprency in the png ot not

Steps To Reproduce

1. add transparency to the custom theme splash.png
2. start LMMS
3. splash screen will not show up

Logs

Click to expand

Screenshots / Minimum Reproducible Project

No response

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