getImportPaths will scan the {component_name}_conf.rsp file to get import paths. The content of the file will be something like this:

-rootPath
/Users/ollivuolteenaho/Qt/Examples/Qt-6.9.1/platforms/android/qtquickview
-cmake-output
-output-file
/Users/ollivuolteenaho/Qt/Examples/Qt-6.9.1/platforms/android/qtquickview_java/app/build/qt_generated/qtquickview/.qt/qml_imports/qtquickview_conf.cmake
-importPath
/Users/ollivuolteenaho/Qt/Examples/Qt-6.9.1/platforms/android/qtquickview_java/app/build/qt_generated/qtquickview/qmlModule
-importPath
/Users/ollivuolteenaho/Qt/Examples/Qt-6.9.1/platforms/android/qtquickview_java/app/build/qt_generated/qtquickview
-importPath
/Users/ollivuolteenaho/dev/qt69/qt5-build-android/qtbase/qml
-qrcFiles
/Users/ollivuolteenaho/Qt/Examples/Qt-6.9.1/platforms/android/qtquickview_java/app/build/qt_generated/qtquickview/.qt/rcc/qmake_qmlModule.qrc
/Users/ollivuolteenaho/Qt/Examples/Qt-6.9.1/platforms/android/qtquickview_java/app/build/qt_generated/qtquickview/.qt/rcc/qtquickview_raw_qml_0.qrc

Based on this it will populate appImports with the paths that start with the buildPath, in this case "/Users/ollivuolteenaho/Qt/Examples/Qt-6.9.1/platforms/android/qtquickview_java/app/build/qt_generated/qtquickview/qmlModule" and "/Users/ollivuolteenaho/Qt/Examples/Qt-6.9.1/platforms/android/qtquickview_java/app/build/qt_generated/qtquickview".

But with https://codereview.qt-project.org/c/qt/qtbase/+/602864 we will also scan these paths for inner qmlmodules based on the qmldir file. This is fine for the first listed item, but for the second one it will rescan the same directories so all found paths will be added twice. Also, because .../qt_generated/qtquickview/qmlModule has a qmldir file even that will be added again. Therefore appImports will have at least .../qt_generated/qtquickview/qmlModule, .../qt_generated/qtquickview and ...qt_generated/qtquickview/qmlModule, and the scan will take twice as long.