[digikam] [Bug 366305] New: Undo is disfunctional for complex operations

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https://bugs.kde.org/show_bug.cgi?id=366305

            Bug ID: 366305
           Summary: Undo is disfunctional for complex operations
           Product: digikam
           Version: unspecified
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: showfoto
          Assignee: [hidden email]
          Reporter: [hidden email]

for most operations the 'undo' function does not work.

Reproducible: Always

Steps to Reproduce:
1. Open image
2. Change color to BW or resize or ...
3. accept changes
4. Edit/undo last operation

Actual Results:  
Modifications on the image persist.

Expected Results:  
Modifications on the image should be undone

This is on version 3.5.0  under ubuntu 14.04

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Frank Steinmetzger <[hidden email]> changed:

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--- Comment #1 from Frank Steinmetzger <[hidden email]> ---
Same here, Digikam 5.0.0 on Plasma 5.7.2, Qt 5.6.1, Frameworks 5.24.0 on Gentoo
Linux.

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Maik Qualmann <[hidden email]> changed:

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--- Comment #2 from Maik Qualmann <[hidden email]> ---
Strangely, this is absolutely not here to reproduce. All processing steps can
undo. Possibly a problem with the undo cache. Please share the output of the
console.

Maik

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--- Comment #3 from Frank Steinmetzger <[hidden email]> ---
Created attachment 100399
  --> https://bugs.kde.org/attachment.cgi?id=100399&action=edit
Showfoto terminal output with comments

There you go. I opened a file in Showfoto, resized and saved it. I inserted
appropriate comments into the log, beginning with "# --------".

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--- Comment #4 from Maik Qualmann <[hidden email]> ---
Free space available in Editor cache [ "/home/frank/.cache/showfoto/" ] in
Mbytes:  753

The minimum free disk space for undo cache is 1024 Mbytes.

Maik

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--- Comment #5 from Frank Steinmetzger <[hidden email]> ---
I see. I replaced ~/.cache/showfoto with a symlink to /var/tmp, which is a 24 G
ramdisk on this machine. Undo works now, thanks for the hint.

I think some kind of notification would be helpful for other unsuspecting
users, though. I saw that log line, too. But I did not think much of it because
it looks like a statement, rather than an error message.

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            Version|unspecified                 |5.0.0
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--- Comment #6 from [hidden email] ---
I agree that Undo manager need to show some message box with relevant
information about missing free space to complete undo registration in temporary
directory.

Gilles Caulier

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--- Comment #7 from ar@home <[hidden email]> ---
(In reply to Frank Steinmetzger from comment #5)
> I see. I replaced ~/.cache/showfoto with a symlink to /var/tmp, which is a
> 24 G ramdisk on this machine. Undo works now, thanks for the hint.
>
> I think some kind of notification would be helpful for other unsuspecting
> users, though. I saw that log line, too. But I did not think much of it
> because it looks like a statement, rather than an error message.

Here the  shofoto cache already resided on /var/tmp/kdecache-'user'/showFoto
which was located on a logical volume that had only 800M left. Putting
/var/tmp/ on an LV with 4G capacity solved the issue.

A message at startup  about the lack of temporary space would be helpful.

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--- Comment #8 from ar@home <[hidden email]> ---
(In reply to Frank Steinmetzger from comment #5)
> I see. I replaced ~/.cache/showfoto with a symlink to /var/tmp, which is a
> 24 G ramdisk on this machine. Undo works now, thanks for the hint.
>
> I think some kind of notification would be helpful for other unsuspecting
> users, though. I saw that log line, too. But I did not think much of it
> because it looks like a statement, rather than an error message.

Here the  shofoto cache already resided on /var/tmp/kdecache-'user'/showFoto
which was located on a logical volume that had only 800M left. Putting
/var/tmp/ on an LV with 4G capacity solved the issue.

A message at startup  about the lack of temporary space would be helpful.

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[hidden email] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Undo is disfunctional for   |Add a message at startup
                   |complex operations          |about the lack of temporary
                   |                            |space to perform Undo
                   |                            |operations

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           Severity|major                       |wishlist

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