Review Request: Internal viewer: improve handling of unknown MIME types

[Commit Hook]

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This review has been submitted with commit 7b0f82bcd6bce2b5d9901152b2280d6e802f7ca9 by Jonathan Marten to branch master.

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On Dec. 29, 2011, 10:04 p.m., Jonathan Marten wrote:
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> (Updated Dec. 29, 2011, 10:04 p.m.)
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> Review request for KDE Utils and Raphael Kubo da Costa.
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> Description
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> Archives often contain files which contain and are viewable as plain text, but either resolve to a MIME type that does not have a suitable viewer KPart available, or the default MIME type application/octet-stream.  Trying to view such a file is simply rejected - and there is no "Open with" operation, so it is not easily possible to open the file in KWrite or another application.
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> This change gives the user the option, in this case, of viewing the file as plain text - whether this is will result in a sensible display for the file is their decision.  If they want to do that, ArkViewer::viewInInternalViewer() is forced to display the file as text/plain and not to try to detect the MIME type from the file name.
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> The size of the internal viewer window is also saved and restored, as per the TODO comment.
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> This change does introduce some new GUI strings, so it will not be able to be committed until after the KDE SC 4.8 release.
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> Diffs
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>   part/arkviewer.h b810e17 
>   part/arkviewer.cpp 9bfd651 
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> Diff: http://git.reviewboard.kde.org/r/103110/diff/diff
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> Testing
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> Built ark with these changes, attempted to preview archive file contents for a variety of file types.  The extremely annoying "The internal viewer cannot preview this file" error message is now a thing of the past.
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> Thanks,
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> Jonathan Marten
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