As mentioned in {T140051#2466572} something's off kilter with the search magnifying glass and placeholder text in Opera Mini out of the gate. They're getting mashed together when observed on 15-July-2016 on en.m.wikipedia.beta.wmflabs.org (but not en.m.wikipedia.org...the train is coming, though).
{F4277841}
en.m.wikipedia.beta.wmflabs.org
We have various options to address this, but for any approach will need to verify non-regression for other permutations of OS/UA/orientation/language directionality.
{T136244} is not fully related, but is worth mentioning here in case the fix can be applied in both places.
Resize browser to 240px (as used by some Opera Mini browsers) and you'll see:
{F4274571}
Expected: We should hide the icon in this situation
[] Hide icon up to 240px threshold
[] ...