slider bug fix

[rtimms]

merge develop into master for release

[codecov]

Codecov Report

Merging #1043 into master will increase coverage by 0.06%.
The diff coverage is 97.43%.

@@            Coverage Diff             @@
##           master    #1043      +/-   ##
==========================================
+ Coverage   97.56%   97.63%   +0.06%     
==========================================
  Files         232      237       +5     
  Lines       12119    12371     +252     
==========================================
+ Hits        11824    12078     +254     
+ Misses        295      293       -2     

Impacted Files	Coverage Δ
...odels/full_battery_models/lithium_ion/basic_dfn.py	100.00% <ø> (ø)
...odels/full_battery_models/lithium_ion/basic_spm.py	100.00% <ø> (ø)
...bamm/models/full_battery_models/lithium_ion/dfn.py	100.00% <ø> (ø)
pybamm/parameters/parameter_sets.py	100.00% <ø> (ø)
pybamm/parameters_cli.py	0.00% <0.00%> (ø)
pybamm/spatial_methods/scikit_finite_element.py	98.24% <ø> (ø)
pybamm/spatial_methods/spatial_method.py	96.15% <ø> (+0.19%)	⬆️
pybamm/spatial_methods/zero_dimensional_method.py	100.00% <ø> (ø)
pybamm/expression_tree/concatenations.py	97.45% <90.90%> (-0.54%)	⬇️
pybamm/models/submodels/interface/sei/base_sei.py	97.82% <92.30%> (ø)
... and 76 more

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