Don't call processEvents when showing input prompts on Mac

- That's not necessary on that platform
- This also fixes our test suite hanging for Mac on CIs.

.github/workflows/macos-tests.yml

@@ -44,7 +44,4 @@ jobs:
           conda list
       - name: Run tests
         shell: bash -l {0}
-        run: |
-          # Disable tests for now because they hang completely
-          # pytest -x -vv --cov=qtconsole qtconsole
-          exit 0
+        run: pytest -x -vv --cov=qtconsole qtconsole

qtconsole/console_widget.py

@@ -2483,7 +2483,8 @@ def _show_prompt(self, prompt=None, html=False, newline=True,
         # This is necessary to solve out-of-order insertion of mixed stdin and
         # stdout stream texts.
         # Fixes spyder-ide/spyder#17710
-        QtCore.QCoreApplication.processEvents()
+        if not sys.platform == 'darwin':
+            QtCore.QCoreApplication.processEvents()
 
         cursor = self._get_end_cursor()