Pyqode.core

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Fixed bugs:

- fix UnicodeDecodeError with the backend process
- fix cursor selection lost after a case conversion
- fix context menu entries not working at mouse position

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Fixed bugs:

- fix a few more type errors when using PyQt5.5
- fix runtime error in outline mode if the editor has been deleted before
the timer elapsed.

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Fixed bugs:

- fix TypeError in FileSystemHelper with PyQt5.5
- fix blank file icons with PyQt5.5

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Fixed bugs:
- FSTreeView: fix bug with cut of directories
- SplittableCodeEditTabWidget: fix keep unique tab text on save
- FileManager: fix bug in clean text when text is empty
- FileManager: fix log level of unwanted/parasiting info messages
- FileManager: don't save file if editor is not dirty and encoding has not changed
- Folding: fix issue with deleting folded scope.

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SplittableTabWidget: Fix save_as not using all mimetypes extensions.

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Fixed bugs:
- fix panels margins not refreshed if panel.setVisible has been called while the editor widget was not visible.
- fix bug with filewatcher on file deleted if the user choose to keep the editor open