Steps to Reproduce the Issue

case sensitive -- casE sENsitive -- case sensitive <== paste the present line in to a tab and try it

Expected Behavior

Search should follow dialog settings, same as non-volatile analogs, esp. non-volatile Select and Find

Debug Information

I discovered it in 8.1.9 (32-bit portable); confirmed in 8.4.5 (32-bit portable) & 8.4.6 (64-bit, normal install). They all have different plugins.