Incorrect sizing and rendering of NatCombo

[fipro78]

NatTable provides a custom control called NatCombo that is used to add a dropdown editor in NatTable. The rendering of the NatCombo looks incorrect with Evolve. To see it directly, here is the screenshot with SWT:

Here is the screenshot with Evolve:

You can see that:

• the width in Evolve seems to be derived from the cell dimensions, but actually the size, especially the width, is calculated based on the content.
• there is a strange space between "Select All" and the other entries, which should not be there.

[fipro78]

The width and the strange space are gone with the current Evolve version 0.324.0

But the height of the NatCombo is slightly to small, which causes the last entry to be shown cut off and a scrollbar is available for very little scrolling. This should not be the case. Also the height of the filter text field seems to be too small now.

Another issue is that the style of the editor (in this case NatCombo) is derived from the application theme. But it should use the style of the cell so the editor feels like a part of NatTable.