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 caret was
in the icon then it is moved to the end of the new string. Only
updates the screen if anything was changed - ie. if the new string
is the same as the old string then nothing will happen. 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
post-fixed with '...'.
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