Created attachment 109287 [details] The file displayed incorrectly. I have a file (attached) containing unicode characters as well as their code-point information in columns. Lines 4-7 appear completely blank, thought the tab indicators are still shown. The font does contain the glyphs in question, and the first two columns are ASCII characters, so they should at least be displayed anyway.
I tried my current installation (openSuSE Tumbleweed), works for me. That means kate 17.08 + frameworks 5.40.0 + Qt 5.9.2. I tried different font-sizes, too.
Created attachment 109469 [details] Screeenshot showing the problem
Created attachment 109470 [details] Proper display of the file using LibreOffice with the same font
Well, it still doesn't work for me. I've attached screenshots showing the problem in Kate, as well as one from LibreOffice displaying the same file with the same font.
Correction: Screenshots don't use the same font, but the problem persists no matter what font I choose (even Noto does not work here).
Created attachment 109471 [details] Screenshot using UTF-7 I think the problem could perhaps be with the UTF-8 decoder. When I'm using UTF-7 or Western encodings like ISO 8859-1, the ASCII characters in the first two columns get displayed correctly.
Created attachment 113930 [details] Working state Hmm, I tried just again, KWrite 18.04.2, KF 5.47.0, Qt 5.11.1
Hmm, I tried just again, KWrite 18.04.2, KF 5.47.0, Qt 5.11.1, see the attachment. No idea what could be fixed here, that seems to kind of work, font is Source Code Pro, UTF-8 encoding for loading.