Fix whole word search slowdown in editor

Reduce repeated iteration through the full text
when counting the number of occurrences of whole
words while searching a file in the editor.

(cherry picked from commit 2433287871ec5ccdf1f85e3e9c057a1a589d3848)

editor/code_editor.cpp

@@ -320,7 +320,7 @@ void FindReplaceBar::_update_results_count() {
 		if (pos == -1) break;
 
 		if (is_whole_words()) {
-			from_pos++; // Making sure we won't hit the same match next time, if we get out via a continue.
+			from_pos = pos + 1; // Making sure we won't hit the same match next time, if we get out via a continue.
 			if (pos > 0 && !is_symbol(full_text[pos - 1]))
 				continue;
 			if (pos + searched.length() < full_text.length() && !is_symbol(full_text[pos + searched.length()]))