LMMS / LMMS/lmms

Mixer window loses focus when moving channels

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bug gui
Dominant language
C++
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Description

**LMMS Version:** 1.2 RC4, Win64
**OS:** Win10

**Issue:**
The mixer window will lose focus when moving channels across channels that contain VST effects.

**Steps to Reproduce:**
1. Create 3 mixer channels
1. Add a VST plugin to channel 1
1. Move channel 3 over channel 2 using the right click menu or by using the Alt+Arrow Key shortcut
1. Window is still in focus
1. Move channel 3 over channel 1 using either method

The Mixer window is no longer in focus. It will lose focus any time step 5 occurs. This bug is extremely annoying and a time drain when trying to move channels across large mixers in larger projects that contain many VST effect plugins.

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Begin by reproducing the focus loss on Windows 10 with LMMS 1.2 RC4: create three mixer channels, add a VST effect to channel 1, and move channel 3 across it using both the right-click menu and Alt+Arrow. Trace the mixer channel-movement behavior and verify that the Mixer window remains focused in both cases.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
audio-video-rtc, desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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