[8.52a x64] Flickering text in CRC-check job window

[MaxX]

TC 8.52a x64 at Windows 7 x64s SP1, video: AMD HD7770 1GB, driver version: 15.11 Crimson Edition.

I see flickering text in CRC-check window while job works.
See video here:
https://www.youtube.com/watch?v=NWGhhoAUIT4
or here:
http://www73.zippyshare.com/v/sIE2DcJo/file.html

There's no flicker when job is done and I scroll text manually.

It looks like some lines are temporary being lost for 1 or 2 frames and then appear again.

Is it bug or feature?

[ghisler(Author)]

Yes, it happens when TC deletes a line and re-adds it with different percent value.

[MaxX]

2ghisler(Author)
Can you make it not delete all the lines, but just clear them? (leave some empty space instead the removed line)
It would be more comfortable to read scrolling text.

[ghisler(Author)]

I don't think that's possible.

[MaxX]

Why not?

[ghisler(Author)]

There is LB_ADDSTRING and LB_INSERTSTRING for Listboxes to add strings at the end or insert at any position, but there is no LB_REPLACESTRING. So TC has to call delete and then insert to replace a string. The alternative would be to use an owner-drawn listbox, but this will cause other problems.

[ErikSP]

You could use WM_SETREDRAW before the delete/insert.

[ghisler(Author)]

Yes, but when I set it back to "ON", this does not cause an automatic redraw.

[ErikSP]

Ah, that's odd, must be some LISTBOX quirk. I'm using WM_SETREDRAW extensively for other controls, and haven't seen issues with it.