WebPositive: do not change URL while user is editing it

If you edit the URL while a page is loading, the URL could be changed
from the page load process, losing your edits.

We now check and update the URL only if the URL bar is currently not
focused, so it is possible to edit the URL safely.

src/apps/webpositive/URLInputGroup.cpp

@@ -666,6 +666,10 @@ URLInputGroup::TextView() const
 void
 URLInputGroup::SetText(const char* text)
 {
+	// Ignore setting the text, if the user is currently editing the URL.
+	if (fWindowActive && fTextView->IsFocus())
+		return;
+
 	if (!text || !Text() || strcmp(Text(), text) != 0) {
 		fTextView->SetUpdateAutoCompleterChoices(false);
 		fTextView->SetText(text);