Attached is the patch to fix the following for filter dialog:
OK button should be disabled for Filter dialog when filter string is empty. Filter dialog should be opened using context menu View Data -> Filtered Rows or shortcut toolbar.
On validation error dialog should not be closed.
User should be able to clear the filter string from the Query Tool.
Validation error should be thrown when filter dialog opened from Query Tool and provide some wrong filter string.
Please review it.
This works better now, but I think there are still some related issues. If I clear the filter, then the filter/sort button stays blue in this mode; and that is because we sort by default.
However; when we open in first/last/view modes, we also sort by default, but *don't* colour the button.
I think that the button should always be blue if there is sorting and/or filtering in place, and that the standard "View" option should *not* sort at all by default.
