If the template parse option `leadingTriviaChars` is configured to consider whitespace as trivia, any trailing whitespace of an element would be considered as leading trivia of the subsequent element, such that its `start` span would start _after_ the whitespace. This means that the start span cannot be used to mark the end of the current element, as its trailing whitespace would then be included in its span. Instead, the full start of the subsequent element should be used. To harden the tests that for the Ivy parser, the test utility `parseR3` has been adjusted to use the same configuration for `leadingTriviaChars` as would be the case in its production counterpart `parseTemplate`. This uncovered another bug in offset handling of the interpolation parser, where the absolute offset was computed from the start source span (which excludes leading trivia) whereas the interpolation expression would include the leading trivia. As such, the absolute offset now also uses the full start span. Fixes #39148 PR Close #40513
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