Bug report #20245
A "Geometry Validation" ghost window appears and suddenly disappears upon every startup
|Affected QGIS version:||3.4.0||Regression?:||No|
|Operating System:||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||28066|
A "Geometry Validation" ghost window appears in the upper-left corner and suddenly disappears upon every startup of QGIS 3.4.0 (standalone installer on W7 64 bit).
The strange behaviour happened also with qgis-dev 3.3.0-100 (from OSGeo4W) and later.
See the following screencast taken with 3.3 (in the red box added by me)
a zoomed frame
Already reported on https://github.com/qgis/QGIS/pull/8103#issuecomment-432820142