Running Valentina 0.7.0.0a (version jan. 3 2020 op 11:50:23) on KDE Neon.
When creating/opening/writing to/from disk the following Warning is sometimes displayed:
QXcbConnection: XCB error: 3 (BadWindow), sequence: 1314, resource id: 44040336, major code: 40 (Translate Coords), minor code: 0
Error occurs in Valentina and in Tape. The values for sequence and for resource id differ each time and you need to go through multiple warning screens before you can continue.
It has no impact on the normal working of the applications.