don't take the min size into account when setting the window size explicitly in wxGTK, just as wxMSW doesn't do it; mention this in the docs and added a unit test to enforce this

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53741 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/test_vc8_test_gui.vcproj

@@ -890,6 +890,9 @@
 			<File
 				RelativePath=".\misc\selstoretest.cpp"
 			/>
+			<File
+				RelativePath=".\window\setsize.cpp"
+			/>
 			<File
 				RelativePath=".\geometry\size.cpp"
 			/>