Fixed findings

List of Findings

Error: COMPILER_WARNING: [#def1]
qqc2-desktop-style-6.12.0/plugin/itembranchindicators.cpp: scope_hint: In member function ‘void ItemBranchIndicators::updateParentChain()’
qqc2-desktop-style-6.12.0/plugin/itembranchindicators.cpp:41:17: warning[-Wc++20-extensions]: C++ designated initializers only available with ‘-std=c++20’ or ‘-std=gnu++20’
#   41 |                 .hasSibling = index.siblingAtRow(index.row() + 1).isValid(),
#      |                 ^
#   39|           while (index.isValid() && (!m_rootIndex.isValid() || index != m_rootIndex)) {
#   40|               auto data = PaintData{
#   41|->                 .hasSibling = index.siblingAtRow(index.row() + 1).isValid(),
#   42|                   .isItem = index == m_index,
#   43|               };

Error: COMPILER_WARNING: [#def2]
qqc2-desktop-style-6.12.0/plugin/itembranchindicators.cpp:42:17: warning[-Wc++20-extensions]: C++ designated initializers only available with ‘-std=c++20’ or ‘-std=gnu++20’
#   42 |                 .isItem = index == m_index,
#      |                 ^
#   40|               auto data = PaintData{
#   41|                   .hasSibling = index.siblingAtRow(index.row() + 1).isValid(),
#   42|->                 .isItem = index == m_index,
#   43|               };
#   44|               m_parentChain.push_back(data);

Error: COMPILER_WARNING: [#def3]
qqc2-desktop-style-6.12.0/redhat-linux-build/plugin/qqc2desktopstyleplugin_autogen/EWIEGA46WW/moc_itembranchindicators.cpp:9: included_from: Included from here.
qqc2-desktop-style-6.12.0/redhat-linux-build/plugin/qqc2desktopstyleplugin_autogen/mocs_compilation.cpp:2: included_from: Included from here.
qqc2-desktop-style-6.12.0/plugin/itembranchindicators.h:14:25: warning[-Wc++20-extensions]: default member initializers for bit-fields only available with ‘-std=c++20’ or ‘-std=gnu++20’
#   14 |     bool hasSibling : 1 = false;
#      |                         ^
#   12|   
#   13|   struct PaintData {
#   14|->     bool hasSibling : 1 = false;
#   15|       bool isItem : 1 = false;
#   16|   };

Error: COMPILER_WARNING: [#def4]
qqc2-desktop-style-6.12.0/plugin/itembranchindicators.h:15:21: warning[-Wc++20-extensions]: default member initializers for bit-fields only available with ‘-std=c++20’ or ‘-std=gnu++20’
#   15 |     bool isItem : 1 = false;
#      |                     ^
#   13|   struct PaintData {
#   14|       bool hasSibling : 1 = false;
#   15|->     bool isItem : 1 = false;
#   16|   };
#   17|   

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