p4a: fix for Qt5 accessibility bug

see 087fc3c583

contrib/android/Dockerfile

@@ -180,7 +180,7 @@ RUN cd /opt \
     && git remote add accumulator https://github.com/accumulator/python-for-android \
     && git fetch --all \
     # commit: from branch accumulator/electrum_20210421d (note: careful with force-pushing! see #8162)
-    && git checkout "8d73dc4f2b74b187c4f1ff59b55873ba1e357b05^{commit}" \
+    && git checkout "087fc3c583d46bfb2dec54878ddea508afb27de6^{commit}" \
     && python3 -m pip install --no-build-isolation --no-dependencies --user -e .
 
 # build env vars

electrum/gui/qml/__init__.py

@@ -65,6 +65,8 @@ class ElectrumGui(BaseElectrumGui, Logger):
         os.environ['QT_VIRTUALKEYBOARD_STYLE'] = 'Electrum'
         os.environ['QML2_IMPORT_PATH'] = 'electrum/gui/qml'
 
+        os.environ['QT_ANDROID_DISABLE_ACCESSIBILITY'] = '1'
+
         # set default locale to en_GB. This is for l10n (e.g. number formatting, number input etc),
         # but not for i18n, which is handled by the Translator
         # this can be removed once the backend wallet is fully l10n aware