Fixed of #5081 Width of sub-label is calculated by using of GetTextExtent() instead of PaintDC->GetMultiLineTextExtent, because of PaintDC is not OK sometimes. For example on GTK3 PaintDC->IsOk() only, when it's using in a native paint event see https://github.com/wxWidgets/wxWidgets/blob/master/src/gtk/dc.cpp, line 346
Fixed of #5081
Width of sub-label is calculated by using of GetTextExtent() instead of PaintDC->GetMultiLineTextExtent, because of PaintDC is not OK sometimes.
For example on GTK3 PaintDC->IsOk() only, when it's using in a native paint event
see https://github.com/wxWidgets/wxWidgets/blob/master/src/gtk/dc.cpp, line 346

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