Bigword movement doesn't handle non-print non-blank characters very well

[lilyball]

Bigword movement uses std::iswblank(c) and std::iswgraph(c) in its implementation, and seems to make the assumption that any character is either blank or graph (or a control character which it doesn't care about). But in the BMP alone there are 6801 codepoints (on my machine running macOS 10.15.6) that are neither blank nor graph or control. Some of these are reserved codepoints, but many are not. For example, Σ (U+03A3 GREEK CAPITAL LETTER SIGMA). Given this, the implementation should probably be using !std::iswblank(c) anywhere it uses std::iswgraph(c).

For that matter, newlines are whitespace but they aren't blank, which means bigword movement stops on every newline, which seems odd. So it should probably be using std::iswspace instead of std::iswblank (the former includes 8 characters the latter doesn't).

[faho]

For that matter, newlines are whitespace but they aren't blank, which means bigword movement stops on every newline

Given how important newlines are, I'd call that correct.

[lilyball]

Bigword movement should not stop on newlines. It should stop on words. If I have several blank lines in a row, bigword movement should not step one newline at a time.

[faho]

I don't think it's a problem, but if you think it is, feel free to change it.

[krobelus]

Bigword movement should not stop on newlines.

On current master, forward-bigword never stops on newlines. However this is also inconsistent, because it doesn't stop if there is a word at the beginning of a line.

For example, on this commandline, forward-bigword will only stop at indented:

'


at-start-of-line

at-start-of-line

  indented

'

[krobelus]

Fixed that, it seems better now.