fix(core): fix drag-region not sending its events correctly

[FabianLars]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
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• New Binding Issue #___
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Does this PR introduce a breaking change? (check one)

• Yes. Issue #___
• No

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
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If adding a new feature, the PR's description includes:

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