fix #313977: avoid adding a palette element twice on double-click #7590
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Resolves: https://musescore.org/en/node/313977
The issue doesn't happen in MuseScore 3.4.2 but happens in the 3.5 version. The possible reason is that #5474 has occasionally reverted the previous commit which had fixed this issue, 77e4347. This pull request returns the empty double-click handler back. Removing the handler entirely causes two
onClicked
events being triggered and results in identical elements being added as well, so we have to put an empty handler there to prevent this.