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* M7: replacing a line keeps the source font for the words it can show (#2378) (#2955) * Fit #2955's line edit to #4514's /ActualText spaces Since #4514, source_show wraps a run whose spaces the subset lacks in a /Span /ActualText BDC ... EMC, so the moves standing in for those spaces read back. #2955's two-font /PCEdLine path writes its source runs through source_show, so they now carry that span too. Three of its tests were written against the operator stream from before that: - replacing_a_mixed_font_line_again_replaces_its_sequence counted BMC and EMC as the /PCEdLine sequences alone. It now also counts each edit's own /ActualText spans (BDC, and EMC = sequences + spans), so a sequence that nests or survives a re-edit still fails it. - a_leading_space_does_not_make_a_source_font_run looked for the leading move right after the Tf; it now sits inside the run's span. - a_row_replaced_inside_a_shared_sequence_starts_in_its_own_font put its second row before the first EMC, which is now the span's: the row was read as part of the span's text. It now goes before the EMC that closes /PCEdLine, the case the test describes. A paragraph rewrite drops an /ActualText span with its line (the span's BDC and EMC are among the line's operators), so it never leaves a row inside one. The code needs no change: re-editing drops the spans inside a /PCEdLine sequence with it (BDC/EMC are in the dropped set), and a span's merged run keeps the sequence it is in, so the line still reads back as one. Also drops the same_font import lines.rs no longer uses. * Tests: fit #2955's three line-edit tests to #4514's /ActualText spans * Tests: the replaced sequence's check allows the new text's own /ActualText span --------- Co-authored-by: mtlcl410 <2368091+mtlcl410@users.noreply.github.com> Co-authored-by: FredApps <FredApps@users.noreply.github.com>