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So, with help of @douglasdgi we solved the problem for make icons that were larger than default size fit the dropdown menus anyway. This was done applying a minor change to the combobox arrows, but keeping in mind it would have affected also other dropdown boxes.
This was made to give Monstro new cooler waveforms icons as i mention in #4940 (so that you can now close it) and also for the new upcoming plugin Microwave that'll use that icons as well.
Here's a before/after the combobox changes


Before:
After:
And also of Monstro as well

Before(Left) - After(Right)
Let me know if you find any issues