Use same float formatting that Qt uses

This was the default formatting that Qt was using before for floats.

This keeps us from accidentally rounding smaller numbers to zero,
like the anisotropic broadening parameters, which are often on the
order of 1e-4.

Signed-off-by: Patrick Avery <[email protected]>

Author: psavery

hexrdgui/calibration/tree_item_models.py

@@ -131,13 +131,13 @@ def data(self, index, role):
             config = self.config_path(path)
 
             if role == Qt.DisplayRole and config.get('_units'):
-                if isinstance(data, float):
-                    # Make sure it is rounded to 3 decimal places
-                    data = round(data, 3)
-
-                # Don't attach units to infinity
                 is_inf = isinstance(data, float) and np.isinf(data)
+                # Don't attach units to infinity
                 if not is_inf:
+                    if isinstance(data, float):
+                        # Format it into a string
+                        data = f'{data:.6g}'
+
                     data = f"{data}{config['_units']}"
 
         return data