Make AHashMap::reserve() do nothing when capacity is already satisfied

[timothyqiu]

void reserve(uint32_t p_new_capacity) {
	ERR_FAIL_COND_MSG(p_new_capacity < get_capacity(), "It is impossible to reserve less capacity than is currently available.");

https://github.com/godotengine/godot/blob/9f03bbf9086a1164490cd7cb4e8dd056bf57eac2/core/templates/a_hash_map.h#L416-L417

Such an error message is unexpected:

• This is against reserve() semantics "ensure available".
• This behavior differs from reserve() found in most programming languages.
• The only way to avoid it is to perform the same check before making the call. There is no real benefit to forcing this "check and skip" logic to the caller.

[Calinou]

@Ivorforce Any ideas on this?

[Ivorforce]

I'm fully on board. I actually already have a PR open for it :)

godotengine/godot#105278

[Ivorforce]

Fixed by godotengine/godot#105278