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When Autogen searches the header for a source files in a target, the expanded real path is used and not the (possibly symbolic) original path of the source file. If the source file path contains symbolic links, then the correct `cmSourceFile` instance of the header won't be found, but a new one will be generated. This way all header source file properties get lost, which is problematic especially for the `SKIP_AUTOMOC/UIC/GEN` properties. This patch changes the header detection in Autogen to use the original source file path instead of the expanded real source file path. Fixes: #19346
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