Use text matrix 'i' instead of 'b'

The correct matrix elements to use for scaling the x-axis are actually the first *column*, so 'a' and 'i', not 'a' and 'b'. My bad! It worked before because almost always the x-axis scaling is equal to the y-axis scaling.

src/Smalot/PdfParser/Font.php

@@ -442,17 +442,17 @@ public function decodeText(
         $words = [];
 
         // Ensure we have a valid $textMatrix
-        // Values 'a' and 'b' come from the top row of the text matrix
+        // Values 'a' and 'i' come from the first column of the text matrix
         // and determine the amount of horizontal (x-axis) scaling. Since
-        // we are only dealing with one line here, we can ignore the 'i'
+        // we are only dealing with one line here, we can ignore the 'b'
         // and 'j' values for vertical (y-axis) scaling, but they are
         // included here for clarity.
-        if (false === is_array($textMatrix) || false === isset($textMatrix['a']) || false === isset($textMatrix['b'])) {
+        if (false === is_array($textMatrix) || false === isset($textMatrix['a']) || false === isset($textMatrix['i'])) {
             $textMatrix = ['a' => 1, 'b' => 0, 'i' => 0, 'j' => 1];
         }
 
         $font_space = $this->getFontSpaceLimit();
-        $font_space = $font_space * (float) $textMatrix['a'] + $font_space * (float) $textMatrix['b'];
+        $font_space = $font_space * (float) $textMatrix['a'] + $font_space * (float) $textMatrix['i'];
 
         foreach ($commands as $command) {
             switch ($command[PDFObject::TYPE]) {

src/Smalot/PdfParser/PDFObject.php

@@ -347,6 +347,11 @@ private function getDefaultFont(Page $page = null): Font
     }
 
     /**
+     * Decode a '[]TJ' command and attempt to use alternate fonts if
+     * the current font results in output that contains Unicode control
+     * characters. See Font::decodeText for a full description of
+     * $textMatrix
+     *
      * @param array<int,array<string,string|bool>> $command
      * @param array<string,float>                  $textMatrix
      */
@@ -719,7 +724,7 @@ public function getTextArray(Page $page = null): array
                                 $whiteSpace = "\n";
                             } else {
                                 $curX = $currentX - $current_position['x'];
-                                $factorX = 10 * $current_position_tm['a'] + 10 * $current_position_tm['b'];
+                                $factorX = 10 * $current_position_tm['a'] + 10 * $current_position_tm['i'];
                                 if (true === $reverse_text) {
                                     if ($curX < -abs($factorX * 8)) {
                                         $whiteSpace = "\t";