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qml6glsink: video content resizes to new item size

Will requested to merge zflat/gstreamer:qml6glsink-notify-geometry-size-changes into main

Overview

Mark geometry dirty when the item rectangle changes in the QtGLVideoItem::updatePaintNode method. This allows changes in the bounding rectangle to be applied to the scene graph geometry node.

I updated the Qt6 implementation at subprojects/gst-plugins-good/ext/qt6/qt6glitem.cc and the Qt5 implementation at subprojects/gst-plugins-good/ext/qt/qtitem.cc.

Screenshots

Here is a screen recording of the applied fix:

Screencast_20240422_104354.webm

References

Fixes #3493 (closed)

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