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ca07e505f9
Problem: The default 'ruler' is implemented in C instead of the 'statusline' DSL. Solution: Replace the C implementation with a default 'rulerformat' expression. This is a continuation of #1248 and #33036. Advantages: - configuration is more discoverable, the default being a useful example - users and plugins can augment the default - code reuse and less C code to maintain - ui2: due to the use of an item group with `minwid`, it can expand instead of truncating when the content gets too long, which is particularly useful for locales with long translations of Top/Bot/All Implementation details: As is the case for 'statusline', when trying to set 'rulerformat' to an empty string, the default expression is restored instead, mimicking how previously the default C implementation would have been activated. Just like before, `:set rulerformat=` and `:set rulerformat&` have the same effect, and the ruler is disabled with `:set noruler`. The default expression uses an item group with `%=`, unlike the fallback in the previous default statusline `%-14.(%l,%c%V%) %P`, because the total width and how it is configured is immediately clear without documentation, it is a more useful pattern in general that works when both sides have flexible width, and it also works for vim, which is useful for configuration sharing/reuse. A truncation marker `%<` is added at the end to mimic how at small screen widths, the scroll percentage would disappear first, so that the cursor position can remain fully visible. BREAKING CHANGES: - `&rulerformat` can no longer be set to an empty string - ui2: the default ruler is no longer of fixed width, but can expand - at very small screen widths (< 36 columns) - ui2: it will no longer try to shrink white-space before truncating - it truncates gradually from the right, whereas previously, the scroll percentage would disappear all at once - l10n can no longer add a space after the comma between line and column (this was only done for one language: Ukrainian)