+20 Flags, reserved (must be zero)
+24 PlugIn instance handle
+28 Browser instance handle
+32 Width (in OS units)
+36 Height
This message is sent by the PlugIn to request that it be resized in its parent. Plugins should use this to resize their windows rather than just issuing Wimp_OpenWindow every time they need to resize, although you might perform the Wimp_OpenWindow as well as this message. The effect of resizing prior to receiving the reply is something you will have to judge for yourself.
The browser will respond with Message_PlugIn_Reshape, but because the windows may be reformatted, this message may not arrive for a period.
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