FC freezes when editing export STEP preferences

[uwestoehr]

- start FC
- use the Part WB
- use menu Edit -> Preferences -> Import-Export -> STEP
- there write into the 'author' field text with an umlaut, e.g. 'stöhr"
- press Apply

result: FC freezes. There is no output in the message panel. Finally one has to kill FC because it is not responding and unusable, no matter how long you wait. It seems to be an unfinished loop because the FC uses the full CPU power of one CPU core as soon as you press Apply.
There is no but if there is no umlaut in the author field. Interestingly other non-ASCII characters don't trigger the freeze, e.g. using 'µ' or '³' work. However since my name contains an umlaut I want to use it of course. If this is not possible FC must tell me about and prevent the input of not allowed character.

OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.15860 (Git)
Build type: Release
Branch: master
Hash: 3b708c7f84b0425076b520e1d95627b20fd75fe0
Python version: 2.7.14
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: German/Germany (de_DE)

[NormandC]

I confirm on

OS: Ubuntu 18.04.2 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.15860 (Git)
Build type: Release
Branch: master
Hash: 3b708c7f84b0425076b520e1d95627b20fd75fe0
Python version: 2.7.15rc1
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: French/Canada (fr_CA)

[openBrain]

Here also. I get the same result using an 'ä'. So despite I didn't try all possible letters, I would suspect the umlaut/trema to be the culprit.

[wmayer]

git commit 1a68b75a4

[wmayer]

git commit 7d0e06c96 makes sure that only 7-bit ASCII can be entered.

[uwestoehr]

I confirm on

Thanks for having a look. I reported this now as issue #3835.

[uwestoehr]

git commit 7d0e06c96 makes sure that only 7-bit ASCII can be entered.

Wow, you are fast! Many thanks.