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c5be331502
Problem: ui2's ruler is no longer of fixed width, and the internal width variable `ru_wid` now acts as an arbitrary maximum, which is unnecessary because the same can now be achieved transparently with an item group. Furthermore, the old way of setting `ru_wid` with an overloaded subset of the item group syntax leads to a number of inconsistencies. In particular, when the configured ruler expression is reused for including the ruler into the statusline, where the item group syntax is interpreted in the usual way. The fact that this width is set in the `minwid` position is more confusing now that it is a de-facto maximum. Solution: for ui2, constrain the ruler only by half the screen width, which previously was an additional limit relevant on small screens. Skip the special-case treatment of the ruler's leading item group spec, process it like a normal item group. Example: the current fallback ruler expression in the default statusline now actually works for `rulerformat` itself: set rulerformat=%-14.(%l,%c%V%)\ %P because the result can naturally expand to 18 cells instead of being truncated to the default 17 cells, and removing the period after `minwid` doesn't change the result, whereas before, it would unhelpfully lead to setting the fixed ruler width to 14 cells. BREAKING CHANGE: if the user used to set the ruler's fixed width, it will now be treated as minimum instead of a maximum width, which in practice increases backwards-compatibility with ui1 and vim. The main remaining difference is that item groups are right-aligned by default, but backwards-compatibility can be achieved by setting a negative `minwid`, which ui1 and vim ignore. To restore the previous fixed width, specify `maxwid` as well, but this does not work in ui1 and vim. If `rulerformat` contains a `%=` without enclosing item group, it will now expand to fill half the screen width. But in that case, it will already spread out similarly in the new expression-based statusline, so consistency of the ruler in both positions is increased. To simulate the previous default behaviour, wrap it in `%-17.17(...%)`. For best compatibility and reuse with vim, leave out `maxwid` and make `minwid` negative, e.g. `%-20(...%)`. fix https://github.com/neovim/neovim/issues/40247
