Add a method to wxPropertyGrid to get the width of a column for a property, without descending into its children
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This patch makes it possible to minimize/optimize the space used by the property grid, when it is put in a popup window. This patch is used for several years already in the Code::Blocks' version of wxPropGrid.
This feature is used to make the popup, which is shown when the user tries to evaluate in the debugger the expression under the cursor, as small as possible without showing scrollbars.
I'm setting the milestone to 3.0 in a hope that it is not to late for this feature to get in.