Allow empty string as intermediate match

QRegularExpressionValidator and QRegularExpression disagree on what a
partial match means.

[ChangeLog][QtGui][QRegularExpressionValidator] Allow empty string as
intermediate match

Change-Id: Ia6c55beb54870b1be5c88b6ef3eceebc8ca3f86b
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/util/qvalidator.cpp b/src/gui/util/qvalidator.cpp
index 93990a8748..aac9282710 100644
--- a/src/gui/util/qvalidator.cpp
+++ b/src/gui/util/qvalidator.cpp
@@ -1013,7 +1013,7 @@ QValidator::State QRegularExpressionValidator::validate(QString &input, int &pos
     const QRegularExpressionMatch m = d->usedRe.match(input, 0, QRegularExpression::PartialPreferCompleteMatch);
     if (m.hasMatch()) {
         return Acceptable;
-    } else if (m.hasPartialMatch()) {
+    } else if (input.isEmpty() || m.hasPartialMatch()) {
         return Intermediate;
     } else {
         pos = input.size();