Fix word wrap issue in SecureQLabel.

securedrop_client/gui/__init__.py

@@ -16,6 +16,7 @@
 You should have received a copy of the GNU Affero General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
+import textwrap
 
 from typing import Union
 
@@ -167,8 +168,11 @@ def __init__(
         flags: Union[Qt.WindowFlags, Qt.WindowType] = Qt.WindowFlags(),
     ):
         super().__init__(parent, flags)
+        self.setWordWrap(True)
         self.setText(text)
 
     def setText(self, text: str) -> None:
         self.setTextFormat(Qt.PlainText)
-        super().setText(text)
+        # Wraps text at default of 70 characters.
+        wrapped = "\n".join(textwrap.wrap(text))
+        super().setText(wrapped)

tests/gui/test_init.py

@@ -1,6 +1,7 @@
 """
 Tests for the gui helper functions in __init__.py
 """
+import textwrap
 
 from PyQt5.QtCore import QSize, Qt
 from PyQt5.QtWidgets import QApplication
@@ -169,3 +170,15 @@ def test_SecureQLabel_setText(mocker):
 def test_SecureQLabel_quotes_not_escaped_for_readability():
     sl = SecureQLabel("'hello'")
     assert sl.text() == "'hello'"
+
+
+def test_SecureQLabel_wraps_on_70():
+    msg = (
+        "thisisaverylongmessagethatwillnotwrapunlessthistestpassesproperly1234"
+        "thisisaverylongmessagethatwillnotwrapunlessthistestpassesproperly1234"
+        "thisisaverylongmessagethatwillnotwrapunlessthistestpassesproperly1234"
+    )
+    sl = SecureQLabel(msg)
+    expected = "\n".join(textwrap.wrap(msg))
+    assert sl.text() == expected
+    assert sl.wordWrap() is True