Kaption stopped working with modern KF5 and Qt5

[atolstoy]

Hello.
Lately I tried to compile your code using KF5 5.64 and Qt 5.13.2. Kaption fails to link as it cannot find KF5::Auth (although I have it). If I manually remove that link inside the code, it builds fine, but then misbehaves: the buttons along the left side of the editor window look erraneously.
It would be great if you update the Kaption code in order to fix it.
Thank you in advance!