Make some DB editor tooltips rich text

This is a quick-n-dirty fix to get the tests work when publishing.
Instead of cutting the text to fixed size, we can make it rich text
which enables Qt to wrap the lines.

spinetoolbox/spine_db_manager.py

@@ -805,8 +805,7 @@ def tool_tip_data_from_parsed(parsed_data):
         else:
             tool_tip_data = None
         if isinstance(tool_tip_data, str):
-            fm = QFontMetrics(QFont("", 0))
-            tool_tip_data = fm.elidedText(tool_tip_data, Qt.ElideRight, 800)
+            tool_tip_data = "<qt>" + tool_tip_data + "</qt>"
         return tool_tip_data
 
     def _format_list_value(self, db_map, item_type, value, list_value_id):

tests/test_SpineDBManager.py

@@ -157,11 +157,11 @@ def test_time_series_in_tool_tip_role(self):
         value = TimeSeriesFixedResolution("2019-07-12T08:00", ["7 hours", "12 hours"], [1.1, 2.2, 3.3], False, False)
         self.db_mngr.get_item.side_effect = _make_get_item_side_effect(*to_database(value))
         formatted = self.get_value(Qt.ItemDataRole.ToolTipRole)
-        self.assertEqual(formatted, "Start: 2019-07-12 08:00:00, resolution: [7h, 12h], length: 3")
+        self.assertEqual(formatted, "<qt>Start: 2019-07-12 08:00:00, resolution: [7h, 12h], length: 3</qt>")
         value = TimeSeriesVariableResolution(["2019-07-12T08:00", "2019-07-12T16:00"], [0.0, 100.0], False, False)
         self.db_mngr.get_item.side_effect = _make_get_item_side_effect(*to_database(value))
         formatted = self.get_value(Qt.ItemDataRole.ToolTipRole)
-        self.assertEqual(formatted, "Start: 2019-07-12T08:00:00, resolution: variable, length: 2")
+        self.assertEqual(formatted, "<qt>Start: 2019-07-12T08:00:00, resolution: variable, length: 2</qt>")
 
     def test_broken_value_in_display_role(self):
         value = b"dubbidubbidu"
@@ -179,7 +179,7 @@ def test_broken_value_in_tool_tip_role(self):
         value = b"diibadaaba"
         self.db_mngr.get_item.side_effect = _make_get_item_side_effect(value, None)
         formatted = self.get_value(Qt.ItemDataRole.ToolTipRole)
-        self.assertTrue(formatted.startswith('Could not decode the value'))
+        self.assertTrue(formatted.startswith('<qt>Could not decode the value'))
 
 
 class TestAddItems(unittest.TestCase):