[Marble-devel] RFC: Use QFileSystemWatcher in MapThemeManager, first try

[Jens-Michael Hoffmann]

Hi,

the attached patch adds a QFileSystemWatcher member to MapThemeManager. There 
are two new slots:

1. directoryChanged
list of watched paths gets updated and MapThemeModel gets updated using 
updateMapThemeModel.

2. fileChanged
corresponding item of model gets removed or updated.

There is some potential to optimize left. For example in case of 
directoryChanged we could update only the corresponding part of the model if 
any.

ChangeLog is also missing for now.

Please feel free to comment. If you approve the patch I would like to commit.

Best regards

Jens-Michael
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