Bugs in built-in file explorer in Ubuntu Desktop 18.04

[Linus Källberg]

Hello,

I want to report two bugs in the built-in file explorer in Ubuntu 
Desktop 18.04. I can't be bothered to first create a Launchpad account, 
so I'm sending my bug report to this e-mail address instead and hope 
that it will end up in the hands of the responsible developers. You 
should really make an effort to simplify for users who are willing to 
take the time to troubleshoot and contribute with bug reports...

Bug no. 1:

The other day I moved all the files from one folder to another with the 
cut+paste method, and then I deleted the now (presumably) empty source 
folder. However, I then noticed that only about 20% of the files had 
actually been moved, and the rest had been deleted along with the 
original folder.

I see two possible explanations for this bug. They are both related to 
the fact that the file explorer program apparently carries out 
subsequent file operations asynchronously (as opposed to queuing them), 
even when they apply to the same files/folders, which can cause race 
conditions. Either the cut operation didn't apply to all the files in 
the original folder: I used Ctrl+A to select all the files before 
pressing Ctrl+X, but perhaps the cut operation was executed before all 
the files had been selected (the folder contained quite a large number 
of files, and there is usually a delay after entering a folder during 
which the thumbnails are being refreshed). The other possible 
explanation is that all the files *were* being moved, but then the 
delete operation was carried out before the move operation had time to 
finish.

Also, it might be relevant that the source folder was a direct 
sub-folder of the target folder, which means that the files became 
"siblings" to their previous containing folder as their were being 
moved. One further explanation for the bug could be that after I 
selected the source folder to delete it, the remaining files appeared 
just in time and became selected at the same time, thus being deleted 
along with the folder. Again, a race condition.

This is a very serious bug. I will never see those files again, as I 
used Ctrl+Del when deleting the source folder.

Bug no. 2:

The following happens for me very frequently. Say I have the following 
folder structure:

A
|- B
|- C
|- some other files/folders...

I'm currently browsing the folder B. Then I go up one level, to A, by 
pressing backspace. I then immediately double-click on the icon for C to 
enter into it. Very frequently, this instead takes me back into folder B.

What appears to be happening is that when I go up from B to A, if I 
double-click the icon for C while the thumbnails in A are being 
refreshed, the program registers that I have double-clicked something, 
but after the thumbnail refresh has finished, the "selected folder" 
reverts back to B. Hence, the program thinks I double-clicked the icon 
for B instead.

I'm available at this e-mail address for follow-up questions.

Yours Sincerely,
Linus