[dolphin] [Bug 426617] Dolphin 100% CPU core usage

[Tonurics]

https://bugs.kde.org/show_bug.cgi?id=426617

Tonurics <tonurics at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |---
             Status|RESOLVED                    |REOPENED

--- Comment #14 from Tonurics <tonurics at gmail.com> ---
I'm afraid to say I'm still seeing the issue in 20.08.3 [reproducible following
the steps in comment 6].

Subjectively, I think 20.08.3 is a bit better. I've left Dolphin idle at a
location that flashes for about 10 minutes and I don't think the CPU usage is
growing over time anymore. As it would eventually get to 100% CPU.

I'll attach a screenshot of the folder I tested with. I was surprised:
Spectacle actually caught the first sub-folder in the middle of a flash [note
half an arrow icon].

By leaving Dolphin idle can report some consistent CPU numbers from top: 

*) Normal usage [with the flashing showing], Dolphin CPU usage stays at:
11.9%-12.6%.

*) Scrolling the Folder panel up [so "foobar2000" and the flashing items are
not visible], Dolphin CPU drops to: 4%-4.3%

*) Collapsing the folder tree [so the sub-folders of "foobar2000" are not items
in the Folder panel tree anymore], Dolphin CPU drops to: 0%

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