from qgis.PyQt.QtWidgets import QWidget, QVBoxLayout, QLabel, QLineEdit
class TabA(QWidget):
tab_title = "Tab A"
def __init__(self, parent=None):
super().__init__(parent)
layout = QVBoxLayout()
layout.addWidget(QLabel("Plugin2 – Tab A"))
layout.addWidget(QLineEdit("Feld A1"))
layout.addWidget(QLineEdit("Feld A2"))
self.setLayout(layout)