if (bstart == ciPtr->baseOffset) {
	    xDisplacement = startX - chunkPtr->x;
	} else {
	    int widthUntilStart = 0;

	    MeasureChars(tkfont, chars, charsLen, 0, bstart,
		    0, -1, 0, &widthUntilStart);
	    xDisplacement = startX - widthUntilStart - ciPtr->baseChunkPtr->x;
	}

	fit = MeasureChars(tkfont, chars, charsLen, 0, bend,
		ciPtr->baseChunkPtr->x + xDisplacement, maxX, flags, nextXPtr);

	if (fit < bstart) {
	    return 0;

	    if (index <= start && (flags & TK_AT_LEAST_ONE)) {
		flags &= ~TK_WHOLE_WORDS;
	    }
	}
	if (index <= start && !(flags & TK_WHOLE_WORDS)) {
	    index = CTTypesetterSuggestClusterBreak(typesetter, start, maxWidth);
	}
	cs = (index <= len && (flags & TK_WHOLE_WORDS)) ?
		whitespaceCharacterSet : lineendingCharacterSet;
	while (index > start &&
		[cs characterIsMember:[string characterAtIndex:(index - 1)]]) {
	    index--;
	}
	if (index <= start && (flags & TK_AT_LEAST_ONE)) {
	    index = start + 1;

}

namespace import -force tk::test::*

namespace import -force tcltest::testConstraint
testConstraint notAqua [expr {[tk windowingsystem] ne "aqua"}]
testConstraint aqua [expr {[tk windowingsystem] eq "aqua"}]
testConstraint x11 [expr {[tk windowingsystem] eq "x11"}]
testConstraint nonwin [expr {[tk windowingsystem] ne "win32"}]
testConstraint aquaOrWin32 [expr {
    ([tk windowingsystem] eq "win32") || [testConstraint aqua]
}]
testConstraint userInteraction 0
testConstraint nonUnixUserInteraction [expr {
    [testConstraint userInteraction] ||
    ([testConstraint unix] && [testConstraint notAqua])
}]
testConstraint haveDISPLAY [info exists env(DISPLAY)]
testConstraint altDisplay  [info exists env(TK_ALT_DISPLAY)]

    .t tag add sel 1.0 end
    expr {[selection get] eq "$x\n"}
} -cleanup {
    destroy .t
} -result {1}


test text-21.1 {TkTextLostSelection procedure} -constraints {x11} -setup {
    text .t
    .t insert 1.0 "Line 1"
    entry .t.e
    .t.e insert end "abcdefg"
    text .t2
    .t2 insert 1.0 "abc\ndef\nghijk\n1234"
} -body {
    .t2 tag add sel 1.2 3.3
    .t.e select from 0
    .t.e select to 1
    .t2 tag ranges sel
} -cleanup {
    destroy .t .t2
} -result {}
test text-21.2 {TkTextLostSelection procedure} -constraints aquaOrWin32 -setup {
    text .t
    .t insert 1.0 "Line 1"
    entry .t.e
    .t.e insert end "abcdefg"
    text .t2
    .t2 insert 1.0 "abc\ndef\nghijk\n1234"
} -body {

    int numBytes,		/* Number of bytes in string. */
    int rangeStart,		/* Index of first byte to draw. */
    int rangeLength,		/* Length of range to draw in bytes. */
    int x, int y)		/* Coordinates at which to place origin of the
				 * whole (not just the range) string when
				 * drawing. */
{
    int widthUntilStart;

    (void) numBytes; /*unused*/

    Tk_MeasureChars(tkfont, source, rangeStart, -1, 0, &widthUntilStart);
    Tk_DrawChars(display, drawable, gc, tkfont, source + rangeStart,
	    rangeLength, x+widthUntilStart, y);
}

/*
 *-------------------------------------------------------------------------
 *
 * CreateClosestFont --
 *

    int numBytes,		/* Number of bytes in string. */
    int rangeStart,		/* Index of first byte to draw. */
    int rangeLength,		/* Length of range to draw in bytes. */
    int x, int y)		/* Coordinates at which to place origin of the
				 * whole (not just the range) string when
				 * drawing. */
{
    int widthUntilStart;

    (void) numBytes; /*unused*/

    Tk_MeasureChars(tkfont, source, rangeStart, -1, 0, &widthUntilStart);
    Tk_DrawChars(display, drawable, gc, tkfont, source + rangeStart,
	    rangeLength, x+widthUntilStart, y);
}

/*
 *-------------------------------------------------------------------------
 *
 * MultiFontTextOut --
 *