R0 = Non-zero for ellipsis (only if enabled in WimpExt_Initialise)
R2 = Window handle
R3 = Icon handle
R4 = Pointer to string
Copies the string pointed to by R2 into the specified indirected
text icon, and updates the screen if necessary. If the string is
longer than the size of the buffer then the right-hand end of the
string is copied (as opposed to the left-hand end, which is the
case if you use WimpExt_SetIconString). If the caret was in the
icon then it is moved to the end of the new string. If R0 is
non-zero and bit 7 was set in R2 in WimpExt_Initialise and the
string is longer than the icon can hold then the string will be
pre-fixed with '...'.
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