moved repeated-prefix and repeated-time classes to tr

[Vaesper]

Also moved the highlight class from the prefix to the tr and modified the repeated-time expression to apply to a timestamp within 3 minutes of the previous one. If desired, this number can be tweaked.

CSS in the themes has been updated to match and this breaks the repeated prefix suppression in the wiki. Proposed update for that (with same flaws as current version):

.repeated-prefix td.prefix a span {
    position: relative;
    left: -1000px;
}

.repeated-prefix td.prefix a span.hidden-bracket,
.repeated-prefix.highlight td.prefix a span.hidden-bracket {
    position: absolute;
    left: -1000px;
}

.repeated-prefix td.prefix a span:nth-last-of-type(2):after {
    content:"↪";
    position: relative;
    left: 1000px;
}

.repeated-prefix.highlight td.prefix a span {
    position: initial;
    left: initial;
}

.repeated-prefix td.prefix a span.hidden-bracket:after,
.repeated-prefix.highlight td.prefix a span:after {
    content: initial;
    position: initial;
    left: initial;
}

[lorenzhs]

Thanks, this looks nice, but the repeated-timestamp logic is hard to follow. It would probably be better to do (UNIX) timestamp diffing here, and have the timestamp exposed in the model, rather than parsing formatted timestrings once more

[lorenzhs]

This should be an attribute of the bufferline. It's impossible to follow the logic when crammed onto a single line like this

[lorenzhs]

Does the outermost span have any function left? I guess we could just style the a it contains instead

[Vaesper]

I just removed it and it doesn't seem to break anything. Any styling of sub-elements of .prefix was already done to span-descendants so it applied to the span-children of the a.