Python error: View -> Set Map Linking buggy

[Fabian Thiel]

This error appeared after successfully linking two map views and then trying to reopen the menu (i.e. View -> Set Map Linking, then python error, window wont open).

Tested on Ubuntu 18.04 but also experienced on windows.

2018-09-02T20:27:13     WARNING    Traceback (most recent call last):
              File "/home/thielfab/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapbox/gui/enmapboxgui.py", line 367, in 
              self.ui.actionMapLinking.triggered.connect(lambda : CanvasLinkDialog.showDialog(parent=self.ui, canvases=self.mapCanvases()))
              File "/home/thielfab/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapbox/gui/mapcanvas.py", line 150, in showDialog
              d.addCanvas(canvases)
              File "/home/thielfab/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapbox/gui/mapcanvas.py", line 202, in addCanvas
              for c in canvas: self.addCanvas(c)
              File "/home/thielfab/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapbox/gui/mapcanvas.py", line 208, in addCanvas
              self.setSourceCanvas(src)
              File "/home/thielfab/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapbox/gui/mapcanvas.py", line 311, in setSourceCanvas
              self.updateLinkSelection()
              File "/home/thielfab/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapbox/gui/mapcanvas.py", line 325, in updateLinkSelection
              link = CanvasLink.between(srcCanvas, targetCanvas)
              File "/home/thielfab/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapbox/gui/mapcanvas.py", line 610, in between
              links = list(set(links))
             TypeError: unhashable type: 'CanvasLink'

[Benjamin Jakimow]

fixed map linking, closes issue #157

→ <<cset ad1e2d06b101>>

[Benjamin Jakimow]

closes issue #157

→ <<cset a8151aea0305>>

[Benjamin Jakimow]

@thielfab still an issue in Linux?

Please try this:

• Open QGIS, Start EnMAP-Box and open 2 new map windows
• Open the python shell and call
• from enmapbox.gui.mapcanvas import MapCanvas, CanvasLink
• Create the two EnMAP-Box Map Windows to be linked
• c1,c2,c3 = MapCanvas.instances()
• hash(CanvasLink(c2,c3, 'CENTER_SCALE')) what is the result?

[Benjamin Jakimow]

resolves #157 (mpa linking) fixed description in examples/settings.py

→ <<cset 18790240cf58>>