Hi devs,
I have a strange behavior with QgsPathResolver that prevent layer to be loaded
if a QgsProject read config file from relative path:
The problem has been reduced to the following behavior (pyQgis):
```
# Init a QgsPathResolver as with a relative path
pr = QgsPathResolver('./geography/data/france_parts.qgs')
pr.readPath('./france_parts/france_parts.shp')
# Output -> '/geography/data/france_parts/france_parts.shp'
# Note the leading '/'
```
Worst:
```
pr = QgsPathResolver('../geography/data/france_parts.qgs')
pr.readPath('./france_parts/france_parts.shp')
# Output -> '/../geography/data/france_parts/france_parts.shp'
# which is a meaningless path
```
The side effect is that if you do:
```
prj = QgsProject()
prj.read("./geography/data/france_parts.qgs")
```
then you get the error:
```
Qgis OGR: Cannot open /geography/data/france_parts/france_parts.shp.()
Qgis : 1 unavailable layers found:
Qgis : * ./france_parts/france_parts.shp
```
This is with Qgis 3.6.1
Can anybody confirm that this behavior is a bug ? I will submit a PR if this
is the case.
Thanks,
Cheers
David
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