attempt to implement as-you-type style for corfu-preview-current #560
Description
Hi, I'm trying to implement corfu-candidate-overlay-like preview styles. Since we already have corfu-preview-current now, I only need to change the text properties(cursor and face) in the overlay. as in #331 , you mention that you didn't manage to achieve acceptable performance. I wonder the status of performance now, I think company-preview-frontend does the pretty same thing, updating the overlay on every keystroke.
In corfu, the preview flickers at first, but it seems to be a redisplay issue instead of performance. the code deletes overlay in pre-command-hook and then force redisplay before the new overlay is computed. Commenting out the following code eliminates the flickering, and I don't feel any lags during these days of usage.
Line 705 in c302b05
It is related to #48. Could this be further optimized? maybe by changing the overlay update logic? or add another option here?