[2.0.7] Drop single item doesn't work on Mouse button 4

[Yivry]

I've had Mouse button 4 set as secondary keybinding for Drop item since 0.17. I upgraded to Space Age, started a new (modless) Default Settings game, and while Z still works, Mouse button 4 does not. Setting the key in settings registers the binding correctly (at least according to the UI), but in-game it doesn't do anything.

Things I've tried without success:
- Unsetting, re-setting (to Mb4) immediately
- Unsetting, returning to game, back to settings, re-setting Mb4
- Unsetting, saving game, fully restarting the game, setting Mb4 again
- Setting Mb4 as primary, Z secondary (note: Z still works)

[vinzenz]

I've had Mouse button 4 set as secondary keybinding for Drop item since 0.17. I upgraded to Space Age, started a new (modless) Default Settings game, and while Z still works, Mouse button 4 does not. Setting the key in settings registers the binding correctly (at least according to the UI), but in-game it doesn't do anything.

Things I've tried without success:
- Unsetting, re-setting (to Mb4) immediately
- Unsetting, returning to game, back to settings, re-setting Mb4
- Unsetting, saving game, fully restarting the game, setting Mb4 again
- Setting Mb4 as primary, Z secondary (note: Z still works)

Mouse button 4 and 5 are now used by the new browse history feature, you can customize it by changing the bindings for "Back" and "Forward" in the keybindings menu.

[Yivry]

Mouse button 4 and 5 are now used by the new browse history feature, you can customize it by changing the bindings for "Back" and "Forward" in the keybindings menu.

Makes sense, however I'm not interacting with anything history-related (I think, at least UI doesn't show anything), shouldn't it then ignore those cases? There are multiple other keybinds that re-use a binding depending on context.

Edit: never mind, it's ui history (tech screen, map, etc) which I hadn't opened yet. Ok, not a bug. Guess I'll map drop to Shift+Mb4

Feature request: show somehow in the keybinding interface that you're mapping a duplicate key? (Yellow background f.e.?)