Answer by olyx for QGIS plugins: dock widget layout is broken
found! on the root widget must place QgsDockWidget container first. And inside it all layouts panels works correctly.
View ArticleQGIS plugins: dock widget layout is broken
When I create QGIS plugin dockwidget UI in Qt Designer it looks OK:But when this plugin is loaded in QGIS, all controls are small size and sticked to zero location like this:Plugin layout is:
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