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qt: Replace deprecated QSignalMapper by lambda expressions
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Authored by Fabien on Mon, Oct 12, 11:00.

Details

Summary
The QSignalMapper class has been deprecated since Qt 5.10.
This PR replaces it by lambdas and does not change behavior.

Backport of core PR16706.

Test Plan

With Qt >= 5.10 and <= 5.13

ninja all check

Check the warnings are gone

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