This has been happening since I migrated to 2019.3.
It happens with almost any kind of dialog generated by an inspector.
Been happening to me too for a few months now. Sometimes 10-15 times before I manage to get focus on the popup. It’s infuriating.
There’s another thread about this + additional issues over here: Unity 2019.3.13f1 - The editor has some kind of input latency and other crazy stuff
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Oh and another fun fact… if you use the arrow keys to select images in the popup, only up/down arrow keys work. Not left/right.The up/down arrow keys always works though. But even if you select another image with the arrow keys and click a different image, it will still not register the click half the time.
Yeah you are right, the search text box seems to be consuming the Left/Right key events