LMMS / LMMS/lmms

Ghost piano segment (plays after being deleted)

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bug
Dominant language
C++
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Avg merge
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Merged PRs (30d)
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Description

This happens sometimes. Not 100% but quite often.

You delete a segment, but it stays there (invisible?) & continues to play. I tried saving and re-opening the project but the bug persists.

Project is attached: https://dl.dropboxusercontent.com/u/64454818/TMP/xx.mmpz

Before saving the project - segmet was deleted with middle button, continues to play
![screenshot_2015-09-01_08-56-51](https://cloud.githubusercontent.com/assets/2041118/9598054/ee409996-5087-11e5-8ef8-a93dba61bdc8.png)

After re-opening project, segment is back there
![screenshot_2015-09-01_08-57-21](https://cloud.githubusercontent.com/assets/2041118/9598063/08f3b4bc-5088-11e5-8a1b-0d1ae03cfcb2.png)

After deleting segment again, still plays
![screenshot_2015-09-01_08-57-35](https://cloud.githubusercontent.com/assets/2041118/9598065/11dceeae-5088-11e5-9760-9cdfde93a09d.png)

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

Open the attached .mmpz project and reproduce the reported sequence: delete the piano segment with the middle button, save and reopen the project, then check whether the segment remains or continues playing. Trace the deletion and persistence behavior from that reproduction. Done means deleting the segment stops playback and it does not return after reopening.

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
25/100

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