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prop.get and Session::expression_errors (Reveal Expression Errors, the viewer's error banner) built their expression context without the footage source, so an expression that reads footage pixels (sampleImage) gave a different value or a spurious error there while it worked in the render and in expr.errors (#1000). expr_tools::eval_ctx builds the render's context (expression host and footage source) for a comp at a time; expr.errors, prop.get, Session::expression_errors and the script value query all use it. Fixes #3231