The viewport menu disappears

Development Getting Started & Setup
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1. Caught the moment when the bug occurred

After an hour or so of screen recording, I managed to capture the moment when the viewport toolbar disappears.


2. Bug description

2.1. Convenience feature of Sequencer: Hide UI elements during playback

The toolbar is hidden during playback so that it does not interfere with viewing the final result by the convenience function of the sequencer. This is normal behavior. The important thing here is to hide it during playback and show it again when playback is over.

2.2. A phenomenon in which the condition for hiding the UI is reversed

However, in the part I captured, the toolbar eventually disappears with the following process.

  1. Naturally, the toolbar is clearly visible when the sequencer is stationary.
  2. When the sequencer is played, the toolbar is hidden as a convenience function.
  3. During playback, the toolbar suddenly appears. (Bug point)
  4. When playback is finished, the toolbar disappears.

What’s odd is that the toolbar isn’t completely gone. The toolbar is displayed again when playback is resumed, and hidden when playback is finished.

The behavior of the convenience function is reversed!!

Now, when you want to use the toolbar function, you can click the play button and quickly operate the toolbar before the playback ends. It’s a joke! Who would want to manipulate like that? After checking all this I restarted the UE.

I captured two GIFs. Seeing it with the text will help you understand the problem.
This is a GIF of the bug. The toolbar is not visible when stopped, but it is visible during playback.
001_Bug

This GIF showing normal operation after restarting the UE. When stopped, the toolbar is visible, and during playback, the toolbar is hidden.
002_RestartUE


3. How to reproduce the bug..??

By the way, I have caught the moment when this problem occurs, but I don’t know the exact conditions to reproduce the problem. I was just checking my animation by pressing the ↑ key and the ↓ key in sequencer quickly and repeatedly. But at some point, the show/hide condition of the viewport toolbar is reversed.

↑ : to move the header to the first frame
↓ : to play from the header position

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