Fixes #2120 (plus changes to status info and tray icon active duration)

[mycir]

Description

Add pre/post backup signals and emit them in BorgCreateJob.pre_post_backup_cmd.
Use them to toggle start/cancel buttons, tray icon active/inactive and provide enhanced status info. Also run VortaApp.create_backup_action/VortaScheduler.create_backup in a new thread to prevent GUI freezing whilst running pre/post backup commands.

Related Issue

#2120

Motivation and Context

I experienced this issue when running pre/post backup commands to mount/unmount a gdrive.
It solves the problem of the backup finished signal occurring before long running post backup commands have completed, preventing the start/cancel buttons being toggled back to their resting state.

How Has This Been Tested?

By running manual and scheduled backups.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have read the CONTRIBUTING guide.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

I provide my contribution under the terms of the license of this repository and I affirm the Developer Certificate of Origin.

[m3nu]

Hi, thanks for the PR! Had a quick look and was wondering if it wouldn't be better to use QThread instead of native Python threads. Example of how those are used here:

vorta/src/vorta/utils.py

Line 34 in 64586df

class FilePathInfoAsync(QThread):

Old discussion here: https://www.mail-archive.com/pyqt@riverbankcomputing.com/msg16052.html

[mycir]

@m3nu, Silly me, I should have searched for QThread in all files - was thinking about it but didn't want add an import just for this.

Yes of course, I'll try and get my head around utils.py as time permits.

[mycir]

@m3nu, please hold. I have a working solution that wraps VortaApp.create_backup_action with an @AsyncRunner decorator which runs it in a QThread. Will try it on VortScheduler.create_backup too. Much grief until I discovered the principles of UniversalDecorator. Was beginning to think what's wrong with a native thread? until I noticed 'This method won't work correctly when called from a non-QThread' in VortaScheduler.pause .

Will commit after I've tidied things up next week - need a break and a hair transplant.

[mycir]

Apologies, tried to make a minor change to 84fbf14 with git commit --amend --no-edit and made a complete hash of it.

[m3nu]

Unresolved conflict.

[mycir]

OK, will action.

[mycir]

Apologies for rogue conflict markers.