Fix Infinite Loop in Multicell with Auto Page Breaks Off (#473)

The updated places that used `AcceptPageBreak` assumed that a page break was added and increased X by the margin.  However, if the break wasn't added, it would put the text further to the right to the point that the width because so small or negative and no characters fit, causing an infinite loop.

Co-authored-by: Nicola Asuni <[email protected]>

tcpdf.php

@@ -6495,14 +6495,16 @@ public function Write($h, $txt, $link='', $fill=false, $align='', $ln=false, $st
 				$shy = false;
 				// account for margin changes
 				if ((($this->y + $this->lasth) > $this->PageBreakTrigger) AND ($this->inPageBody())) {
-					$this->AcceptPageBreak();
-					if ($this->rtl) {
-						$this->x -= $margin['R'];
-					} else {
-						$this->x += $margin['L'];
+					if ($this->AcceptPageBreak())
+					{
+						if ($this->rtl) {
+							$this->x -= $margin['R'];
+						} else {
+							$this->x += $margin['L'];
+						}
+						$this->lMargin += $margin['L'];
+						$this->rMargin += $margin['R'];
 					}
-					$this->lMargin += $margin['L'];
-					$this->rMargin += $margin['R'];
 				}
 				$w = $this->getRemainingWidth();
 				$wmax = ($w - $this->cell_padding['L'] - $this->cell_padding['R']);
@@ -6700,14 +6702,16 @@ public function Write($h, $txt, $link='', $fill=false, $align='', $ln=false, $st
 					}
 					// account for margin changes
 					if ((($this->y + $this->lasth) > $this->PageBreakTrigger) AND ($this->inPageBody())) {
-						$this->AcceptPageBreak();
-						if ($this->rtl) {
-							$this->x -= $margin['R'];
-						} else {
-							$this->x += $margin['L'];
+						if ($this->AcceptPageBreak())
+						{
+							if ($this->rtl) {
+								$this->x -= $margin['R'];
+							} else {
+								$this->x += $margin['L'];
+							}
+							$this->lMargin += $margin['L'];
+							$this->rMargin += $margin['R'];
 						}
-						$this->lMargin += $margin['L'];
-						$this->rMargin += $margin['R'];
 					}
 					$w = $this->getRemainingWidth();
 					$wmax = $w - $this->cell_padding['L'] - $this->cell_padding['R'];