Tooltip for Matrix visual (and others)
For the Matrix and the Table Visuals (and others), tooltips simply show the value of the item over which the Pointer hovers. The behaviour of the tooltips differs from PBI Desktop to Browser in Terms of Duration of being shown and the truncation of longer texts.
Other visuals (e.g. bar chart) have a customizable tooltip that can be filled by a special field well. Please add the same functionality to table and Matrix visuals!
Additionally, it would be great to have a tooltip for editing lengthy and complex measures with many variables, so that when you hover over the cell, it shows the locally calculated values for each variable in the measure.