Assembly: Fix help text height in CreateBom

src/Mod/Assembly/CommandCreateBom.py

@@ -357,6 +357,7 @@ class TaskAssemblyCreateBom(QtCore.QObject):
         help_dialog.setWindowFlags(QtCore.Qt.Popup)
         help_dialog.setWindowModality(QtCore.Qt.NonModal)
         help_dialog.setAttribute(QtCore.Qt.WA_DeleteOnClose)
+        help_dialog.setFixedWidth(500)
 
         layout = QtWidgets.QVBoxLayout()
         layout.setContentsMargins(10, 10, 10, 10)
@@ -413,9 +414,14 @@ class TaskAssemblyCreateBom(QtCore.QObject):
             + "\n"
         )
 
-        options_text.setWordWrap(True)
-        columns_text.setWordWrap(True)
-        export_text.setWordWrap(True)
+        layout_width = (
+            help_dialog.contentsRect().width()
+            - layout.contentsMargins().left()
+            - layout.contentsMargins().right()
+        )
+        for label in (options_text, columns_text, export_text):
+            label.setWordWrap(True)
+            label.setFixedWidth(layout_width)
 
         layout.addWidget(options_title)
         layout.addWidget(options_text)
@@ -425,7 +431,6 @@ class TaskAssemblyCreateBom(QtCore.QObject):
         layout.addWidget(export_text)
 
         help_dialog.setLayout(layout)
-        help_dialog.setFixedWidth(500)
 
         help_dialog.show()