Export file dialog shows directories. Small refactoring.

[OndroMih]

File filters for export dialog now extend file filter from open dialog, instead of a completely separate class. It fixes folders not visible in the export dialog.

[codecov-io]

Current coverage is 61.59%

Merging #168 into develop will increase coverage by +0.06% as of 6fca41a

@@            develop    #168   diff @@
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  Files           132     132       
  Stmts          7618    7617     -1
  Branches       1354    1355     +1
  Methods           0       0       
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+ Hit            4688    4692     +4
- Partial         418     420     +2
+ Missed         2512    2505     -7

Review entire Coverage Diff as of 6fca41a

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[chewiebug]

Hi Ondrej,

This looks like a good refactoring. Showing the directories in the export dialog feels like a good idea. I think, you broke filtering of the files by extension, however. I'll try to give you a hint on where in the code.

Best regards,
Jörg

[chewiebug]

To conform to the "accept()" implementation of ExtensionFileFilter you need to remove the "." from the file extensions here. The implementation of the deleted and the new "accept()" differs in exactly this point. Otherwise no files are shown any more in the export dialog.

[OndroMih]

You have eyes everywhere :) I must have missed that. The fix is already committed.

[chewiebug]

Thank you very much - I have merged your pull request and added you to the list of contributors.