I observed many PDFs in our application, which contain WordText objects consisting of several whitespaces. The problem with those whitespaces is they prevent a text from being hit.

Unfortunately, I cannot upload those PDFs because of copyright restrictions, but I managed to find equivalent PDF in the Internet: https://ipres2017.jp/wp-content/uploads/35Michelle-Lindlar.pdf
I attached it to this ticket, see 35Michelle-Lindlar.pdf.

This looks like a regression since 6.2.2, see comparison screenshot attached.

Steps to reproduce:
1) Open attached PDF in Viewer RI.
2) Navigate to Search pane (Ctrl + F).
3) Type "test-set for PDF validation", click "Search" button and observe results.

Actual behavior:
a) nothing is highlighted on page 1 (see comparison.png attached).
b) "Searched 11 pages (0 matches)" text appears at the bottom of search pane

Expected behavior:
a) "test-set for PDF validation" should be highlighted on page 1
b) "Searched 11 pages (1 match)" text should appear at the bottom of search pane