Unlikely.  

1. Geany does not know how wide the text entry is, you can resize the dialog 
and it grows/shrinks
2. Geany does not know how wide the displayed text is, its Unicode, so number 
of bytes != number of code points != number of glyphs and those can be varying 
widths depending on font and font size chosen

So Geany would have to replicate most of the GTK layout code just to tell if 
the text exceeded the available width, pretty unlikely to happen, in fact (as 
best anyone can predict such things) won't ever happen unless its added to the 
text entry widget in GTK, sorry.

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