document that CanRead() and GetImageCount() functions of wxImageHandlers do NOT modify the current stream position and that they require seekable streams; rename current GetImageCount() functions to DoGetImageCount() and put save-and-restore stream position logic in GetImageCount(); add comments in the various DoCanRead() and in DoGetImageCount() where the stream position is modified; remove unneeded SeekI(0) calls from DoCanRead() and DoGetImageCount() functions: they didn't allow to load images from non-seekable streams; implement forward-seeking in wxInputStream::SeekI() also for non-seekable streams

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60852 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/imagxpm.cpp

@@ -218,6 +218,7 @@ bool wxXPMHandler::DoCanRead(wxInputStream& stream)
 {
     wxXPMDecoder decoder;
     return decoder.CanRead(stream);
+         // it's ok to modify the stream position here
 }
 
 #endif  // wxUSE_STREAMS