Use title of slider in HTML report menu (#6149)

* Use title of slider in HTML report menu

* Test removing sliders

Author: wmvanvliet

mne/report.py

@@ -1321,7 +1321,7 @@ class construction.
         slider_klass = sectionvar
 
         self._add_or_replace(
-            '%s-#-%s-#-custom' % (section, sectionvar), sectionvar,
+            '%s-#-%s-#-custom' % (title, sectionvar), sectionvar,
             slider_full_template.substitute(id=global_id, title=title,
                                             div_klass=slider_klass,
                                             slider_id=slider_id, html=html,

mne/tests/test_report.py

@@ -279,7 +279,8 @@ def test_add_slider_to_section():
                     subject='sample', subjects_dir=subjects_dir)
     section = 'slider_section'
     figs = _get_example_figures()
-    report.add_slider_to_section(figs, section=section)
+    report.add_slider_to_section(figs, section=section, title='my title')
+    assert report.fnames[0] == 'my title-#-report_slider_section-#-custom'
     report.save(op.join(tempdir, 'report.html'), open_browser=False)
 
     pytest.raises(NotImplementedError, report.add_slider_to_section,
@@ -348,7 +349,8 @@ def test_remove():
     r = Report()
     fig1, fig2 = _get_example_figures()
     r.add_figs_to_section(fig1, 'figure1', 'mysection')
-    r.add_figs_to_section(fig1, 'figure1', 'othersection')
+    r.add_slider_to_section([fig1, fig2], title='figure1',
+                            section='othersection')
     r.add_figs_to_section(fig2, 'figure1', 'mysection')
     r.add_figs_to_section(fig2, 'figure2', 'mysection')