Custom SVG styles aren't loaded

[qgib]

Author Name: Patrick Dunford (@enzedrailmaps)
Original Redmine Issue: 17707
Affected QGIS version: master
Redmine category:symbology

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This seems to be an enduring problem or not well documented in Qgis that I can ever remember but it seems to have been working properly in earlier masters and stopped working again in later ones.
I have found almost consistently except for this rare period when it actually worked that every time I set up a new installation of Qgis and load the styles into Style Manager that my styles which have a custom SVG symbol have the symbols missing and I have to every single time go through and add these symbols back to the styles manually.
With a style file like the attached loading it in master 313ec55 will find all the custom SVGs and load them straight off from the xml file, the later masters e.g. the current one will not.
Just to make it even more complex I have some layers with rule based styles, these will not remember the custom SVGs so every time I open a project for the first time after installing Qgis I have to go through and set all these by hand as well.
Given there is a path stored to the SVG file inside the XML file for each style it can't be that hard surely?

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• Map Styles 45.3.xml (Patrick Dunford)

[qgib]

Author Name: Giovanni Manghi (@gioman)

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Please check if this issue is still valid on QGIS 3.4.5 or 3.6.

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• status_id was changed from Open to Feedback

[gioman]

@enzedrailmaps path must be absolute or relative to "/usr/share/qgis/svg/" (or whatever is the folder where the QGIS installer places the SVG symbols in your system).

[github-actions]

The QGIS project highly values your report and would love to see it addressed. However, this issue has been left in feedback mode for the last 14 days and is being automatically marked as "stale".
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[gioman]

Closing for lack of feedback.