signature: improve error handling for embedded applications

Entering something like

"""
mainWindow.setPointer(None)
"""

crashes in an old version of scriptableapplication, which
shows an omission in the signature interface. The error
shows up whenever a builtin module cannot be imported.

The error does not show up in PySide 6, because the
module is declared as a builtin via `PyImport_AppendInittab`.

* add registration of AppLib as a builtin (5.15)

* insert builtin modules per default into the mapping module

* simple recovery if a module cannot be found in sys.modules

[ChangeLog][shiboken6] Error handling was improved for embedded
applications and builtin modules are trusted as valid modules.

Change-Id: I722212a52a5e3aae924f0b965578485ecaf185a9
Fixes: PYSIDE-1710
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
(cherry picked from commit 2149a45fddeedea317dccbfe5e5b14e13888e5c9)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/sources/shiboken6/shibokenmodule/files.dir/shibokensupport/signature/errorhandler.py b/sources/shiboken6/shibokenmodule/files.dir/shibokensupport/signature/errorhandler.py
index 0c1b72644..4c436eafd 100644
--- a/sources/shiboken6/shibokenmodule/files.dir/shibokensupport/signature/errorhandler.py
+++ b/sources/shiboken6/shibokenmodule/files.dir/shibokensupport/signature/errorhandler.py
@@ -104,8 +104,8 @@ def seterror_argument(args, func_name, info):
     try:
         func = eval(func_name, namespace)
     except Exception as e:
-        msg = f"Internal error evaluating {func_name}: " + str(e)
-        return TypeError, msg
+        msg = f"Error evaluating `{func_name}`: {e}"
+        return type(e), msg
     if info and type(info) is str:
         err = TypeError
         if info == "<":