stacking demo of bars with lines improperly clips lines

Hi there!

First, thank you for the effort you've put into uPlot. It's a very impressive bit of kit.

The issue I'm running into pertains to drawing a chart with sets of series that use differing path types. I've experimented with the drawing order of each series and the data for each series, but I can't find a configuration that does not produce visual issues.

As a forewarning, I am using the stacked series plugin.

Example (using stacked series plugin):

const chartData = [[1553817600,1556578800,1559257200,1561676400,1572480000,1574985600,1577750400,1580428800,1582848000,1585609200,1588201200,1590706800,1593471600,1596150000,1598828400,1601420400],[68132,12102,23457,null,null,null,null,null,null,null,null,null,null,null,null,null],[31404,32061,36870,138926,29621,27995,25200,33596,36822,24411,34831,37553,38109,146347,79291,57954],[68132,12102,23457,null,null,null,null,null,null,null,null,null,null,null,null,null],[31404,32061,36870,138926,29621,27995,25200,33596,36822,24411,34831,37553,38109,146347,79291,57954]]
const chartOptions = {"width":773,"height":386.5,"series":[{},{"label":"Class A Shares","stroke":"#fc8764","spanGaps":true,"fill":"#fc8764","points":{"show":false}},{"label":"Class F Shares","stroke":"#ffb561","spanGaps":true,"fill":"#ffb561","points":{"show":false}},{"label":"Class L Shares","stroke":"#ff6b6b","spanGaps":true,"width":3},{"label":"Class Z Shares","stroke":"#7cd6fd","spanGaps":true,"width":3}],"axes":[{"space":70,"grid":{"show":false},"stroke":"#555b51","font":"12px inherit","gap":8},{"font":"12px inherit","stroke":"#555b51"}],"plugins":[{"hooks":{"setScale":[null],"setSeries":[null]}}],"scales":{"y":{}},"bands":[{"series":[2,1]},{"series":[3,2]},{"series":[4,3]}],"hooks":{"setSeries":[null]}}

This produces a graph that looks like this:

A few things I found interesting;

• The visual gap issue only occurs when there are one or more differing path styles
• The visual gap is only present on a line style series if it is preceded by a bar style series
• The issue only occurs when using the stacked series plugin.

Without stacked series plugin

When I draw different sets without using the stacked plugin (which I prefer), I don't get the visual gap issue, but my bar type series' can occlude each other visually which is also a problem. Is there a way I can work around this?

See below for example;

Class F toggled on:	Class F toggled off:

Reproduce the supplied chart configuration with the stacked series plugin, then inspect the plugin's handling of mixed bar and line path types and drawing order. Compare the stacked and non-stacked examples; done means stacked line series no longer show visual gaps and bar series do not improperly occlude one another.