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What does the pull request do?
Remove a dpi hack added here, #16143 . This is no longer needed, as toplevels now invalidate themselves when there's any dpi changes. The issue the hack was fixing is properly fixed here #18315 .
What is the current behavior?
When a dialog window is opened, because no dpi updates are sent to it when the dialog parent is set, the dialog toplevel doesn't invalidate its visual, thus it will use the default 1x scale when rendering.
What is the updated/expected behavior with this PR?
How was the solution implemented (if it's not obvious)?
Checklist
Breaking changes
Obsoletions / Deprecations
Fixed issues
Fixes #18921
Fixes #18903