Inkscape editing repeating pattern

Question

I’m trying to edit a repeating pattern in Inkscape. I covert the pattern to objects and make my changes (adding some additional company’s), select them all and create pattern from objects.

The resulting pattern appears to have a different boundary extent, so the repeating pattern doesn’t align.

Can I set an extent to the newly created pattern?

EDIT 1:

I'm trying to create swatches of geological symbols to use in a QGIS map. My original data source was here, where some kind person has already converted the FGDC digital cartographic standard to SVG: USGS Inkscape pack instructions

I'd like to alter one of these swatches from this:

to this (but nicer - this image just to show the intent):

EDIT 2: I've added an inkscape svg document (xml, download and save as .svg) to pastebin to show what I mean about different boundaries. Ideally, the end result would have the same boundary/mask/extent as the original - in teh same position to preserve the repeating pattern.

I can see in the xml hierarchy where the boundary is applied - I just don't know how to generate it in Inkscape

xml - contents of inkscape svg

Answer 1

It is indeed difficult.

What I ended up doing was:

1. convert the pattern to object
2. Ungroup its contents and combine all paths into one
3. use round stroke caps
4. clip the path to the actual stroke end nodes
5. clone this thing four times and place the clones like a cross around the original, snapping object corner to object corner
6. manually adjust the node positions that still don't match now.

This results in: https://pastebin.com/t0PzPghw