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G++ does not have transform_reduce until C++20, despite being part of the
C++17 standard. This reverts the only usage of Parallelism TR2 in KIO.
--- kio-5.94.0/src/filewidgets/kurlnavigator.cpp.old 2022-05-12 07:14:39.000000000 -0500
+++ kio-5.94.0/src/filewidgets/kurlnavigator.cpp 2022-06-03 01:42:48.541164895 -0500
@@ -729,11 +729,11 @@
availableWidth -= m_protocols->width();
}
- auto MinWidth = [](const KUrlNavigatorButton *button) {
- return button->minimumWidth();
- };
// Check whether buttons must be hidden at all...
- const int requiredButtonWidth = std::transform_reduce(m_navButtons.cbegin(), m_navButtons.cend(), 0, std::plus<>(), MinWidth);
+ int requiredButtonWidth = 0;
+ for (const KUrlNavigatorButton *button : std::as_const(m_navButtons)) {
+ requiredButtonWidth += button->minimumWidth();
+ }
if (requiredButtonWidth > availableWidth) {
// At least one button must be hidden. This implies that the
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