Roland Reichwein b860326b26 Fix delegate not being cleared by assigning empty braces (#1401) ... * Fix delegate not being cleared by assigning empty braces Fixes issue #1399. The non-capturing lambda support (PR#1295) added a non-explicit delegate(function_ptr) constructor and operator=(function_ptr). This caused `delegate = {}` to implicitly convert `{}` to a null function pointer and bind it via function_ptr_stub, leaving the delegate appearing valid (stub != nullptr) but invoking through a null pointer (undefined behavior). Fix: - Mark delegate(function_ptr) constructor explicit to prevent implicit conversion from `{}` during initialization. - In operator=(function_ptr), clear the delegate when fp is null instead of binding a null pointer through function_ptr_stub. Added tests verifying that both `delegate d = {}` and `d = {}` produce an invalid (cleared) delegate. * Fix Dockerfile for powerpc cross build Debian snapshot sources were mixed with plain sid sources which mismatched after a while. Now, aligning all sources from snapshot server.		2026-04-21 15:27:43 +02:00
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etl	Fix delegate not being cleared by assigning empty braces (#1401)	2026-04-21 15:27:43 +02:00