tracker/pt, options: fix threshold slider

It's only the tie_setting(slider_value, QSlider) that
has race-free slider updates. Needed to update the
threshold slider representation.

Remove the tie_setting(int, QSlider) overload since it
doesn't have the logic.

Add a migration.

Add base_value::notify() for use-cases like the
checkbox updating the label.

1 files changed, 5 insertions, 0 deletions

diff --git a/options/base-value.cpp b/options/base-value.cpp
index 29f4b496..a07886bb 100644
--- a/options/base-value.cpp
+++ b/options/base-value.cpp
@@ -16,6 +16,11 @@ base_value::~base_value()
     b->on_value_destructed(self_name, this);
 }
 
+void base_value::notify() const
+{
+    bundle_value_changed();
+}
+
 void base_value::store(const QVariant& datum)
 {
     b->store_kv(self_name, datum);