Original bug title:
"Do not invalidate translations" checkbox at [[Special:PageTranslation]] should be checked by default if change does not require updating translations
(taling about "This page has changes since it was last marked for translation." where "marked for translation" points to the page with the translation units and diffs)
This happens e.g. if you change a variable:
text in translatable section <tvar>500</> -->
text in translatable section <tvar>501</>
Version: unspecified
Severity: enhancement
See Also: T46328: Replace outdated translations with source text on translation pages