[kleopatra] [Bug 362640] New: cryptic error message, when using long password to export secret key

[Stefan via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=362640

            Bug ID: 362640
           Summary: cryptic error message, when using long password to
                    export secret key
           Product: kleopatra
           Version: 2.2.0
          Platform: Other
                OS: MS Windows
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: aheinecke at intevation.de
          Reporter: luke1410 at gmx.de
                CC: kdepim-bugs at kde.org, mutz at kde.org

Following the described steps the Kleopatra presents an error message which is
not quite user friendly. In fact it should be possible to use a long password
(as the one given in the repro steps). 

I understand that the issue is that the specified password is too long but
there are several usability glitches here:
1. the input field to set a password to encrypt the keyfile does allow entering
a long password and neither the displayed text hints to any limit there, nor is
there a warning/error displayed when clicking OK after having entered the long
password - at least there should be some mentioning on the restriction.
2. Given that very long passphrases are generally advertised in all docs
related to GnuPG, IMO there should be no character limit for the password here
at all.
3. The displayed error in the end is not quite user friendly. It's so cryptic
and for someone not reading the whole text in detail it won't directly point to
the actual issue (too long password). Such an error should be better presented
to the user IMO. A simple error message would suffice:
"An error occurred while trying to export the secret key.
Error: password too long"

Any additional details are only of interest to developers and should not be
presented to users.


Reproducible: Always

Steps to Reproduce:
1.on an existing X.509 key right click and select: "Export Secret Keys...."
2. select an output file and click ok
3. enter the key's passphrase -> press ok
4. enter the following password for the exported key:
0f9guf9dhgsadi90sdg0ßfd0hdgj0df -> press ok
5. enter the same password to confirm it -> press OK

Actual Results:  
The following error is displayed

Title: Secret Key Export Error --- Kleopatra

An error occurred while trying to export the secret key.

The output from E:\Program Files (x86)\GNU\GnuPG\gpgsm.exe was: gpgsm:
gpg-protect-tool: AllowSetForegroundWindow(6380) failed: Access is denied.
gpgsm: gpgsm: gpg-protect-tool: AllowSetForegroundWindow(3692) failed: Access
is denied. gpgsm: gpgsm: gpg-protect-tool: password too long gpgsm:
gpg-protect-tool: password too long gpgsm: gpg-protect-tool: password too long
gpgsm: error running 'E:\Program Files (x86)\GNU\GnuPG\gpg-protect-tool.exe':
exit status 2

Expected Results:  
Password file is generated without errors.

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