implify recent file handling in mainwindow.cpp

The old code used to be unnecessarily complex: the recent files list
was extended for each file and shrunk if a load failed.

By adding a file to the recent file list only if the load succeeded, a
whole method could be removed.

Other changes: keep track of the recent files using a QStringList and
clearly separate the actions:
 - Read recent files from settings [loadRecentFiles()]
 - Write recent files to settings [updateRecentFiles()]
 - Update the recent files actions in the menu [updateRecentFilesMenu()]
 - Add a file to the list of recent files [addRecentFile()]
With this reorganization the code hopefully became more clear.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

0 files changed, 0 insertions, 0 deletions