Qt

What is a High DPI Display? In the past, most displays had (or the OS pretended to have) around 96 PPI, more or less. If you differed a bit and had too small/large UI elements, you mostly just resized your default font size a bit and were kind of happy. ...

As you can read in the official Creator 4.9.0 release announcement, Qt Creator now uses the KSyntaxHighlighting Framework for providing the generic highlighting. This is a nice step for the wider adoption of this MIT licensed part of the KDE Frameworks. ...