Strange entries in config caused by my mouse model?

[Foebane]

I have come across an unusual configuration addition which I think is related to my Logitech M90 mouse, which didn't appear before.

I have attached the configuration in question, and I'm wondering why these two lines below have appeared:

input.1.mouse.0.button.3=KEY_ALT_LEFT.0,KEY_CURSOR_LEFT.0.0
input.1.mouse.0.button.4=KEY_ALT_LEFT.0,KEY_CURSOR_RIGHT.0.0

They don't make sense, the mouse only has left/right buttons and a scroll wheel with a third button, but where does button 4 come from?

These lines also only appear in configurations to which I've added these two lines:

input.1.keyboard.0.button.74.SUBTRACT='cachesize=0'.0,SPC_VOLUME_DOWN.0.I,SPC_MASTER_VOLUME_DOWN.0.IK,SPC_DECREASE_REFRESHRATE.0.IJ
input.1.keyboard.0.button.78.ADD='cachesize=16384'.0,SPC_VOLUME_UP.0.I,SPC_MASTER_VOLUME_UP.0.IK,SPC_INCREASE_REFRESHRATE.0.IJ

These are my JIT control keys for 68040 stuff, using uae-configuration.

Is this some kind of bug related to my model of mouse, or is it normal behaviour?

[Toni Wilen]

It is normal. It by default sets all 5 buttons, even if current mouse has less buttons.

[Foebane]

Originally Posted by Toni Wilen

It is normal. It by default sets all 5 buttons, even if current mouse has less buttons.

Interesting. The two "mouse" lines only appear in configurations where the "cachesize" lines already exist. No relation? I'm just wondering, but if it's normal behaviour, I'll acknowledge that.