Fix code editor moving lines without selected characters #72672
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Fixes #54362
Supersedes #72270 and #54392
When the selection ends at the start of new line, move_lines_up/down shouldn't affect that line. Makes more sense with empty lines once #72265 gets fixed.
Function and code logic is the same as #72270, but this refactors line selection logic to a separate function.
Add helper functions to get lines that are affected by line operations. These are used in other similiar operations (#72679, #72675, #72671). These likely need to be rebased after one of them gets merged.