First, sorry for my english and sorry if this is not a bug ... I think yes, but ...
When you create a chart with attachments charts (to create a chart with various series), you create a father chart and a some child chart series to combine in one (in the father). Ok, I put a example, some categories of spents (food, fuel, other, clothes) each one in one chart attachment as a serie (one of them as a father chart, of course). Each one have some "point" to create a line charts, for example, some years: 2019, 2020, 2021, 2022 So, we have a chart with a spents along the years (y axis) and some lines (series) with our categories. Ok, all right. But ... what happens if one category (for example food) have not all year (for example 2020 year)? This serie reduce in one its charts "point" and go to left in the chart all its points after this year. You understand me? I put down a capture with the bug chart and the bug solved.
I changed the code (sure improvable). I upload the file with the changes. I explain shortly. When all data chart is generated, in template_preprocess_views_view_charts I loop the chart data again. First the categories array after all categories are uniques and generated. After that, I loop the array data to look up for series with less number of data than the number of unique categories. Search the category is not present in array data and insert a cero value data for this category and this serie.
Repeat, it is improvable, sure.
Thanks.
Needs review
3.0
Code
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Added patch by formatting the code in patch #15, please review it.
Thanks
Mrinalini
mrinalini9, I don't know what's the difference between your patch and mine (both looks the same fix code). Mine is working in charts 3.4 too. Tested.
Thanks
Victor