[Rd] Warning for dropped text with devices that don't support clipping

[Sebastian Fischmeister]

Hello,

   Without feedback, it's hard to understand why text does not show up  
in the output—especially, if it shows up on one device but not on  
another. I suggest adding a warning message when text gets ignored,  
because the device doesn't support clipping (see the attached patch).  
Unfortunately, I cannot add a test, because warnings are sent to  
stderr and not stdout; however, the attached R script shows the warning.

A point for discussion is: how often does the described case occur and  
will a warning message confuse the user? For example, warnings as text  
gets completely clipped (engine.c:1417) will offend users, because  
they happen too often. But then again, all devices will most likely  
omit the text in this case. This is does not hold for the described  
case.

   Sebastian


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