C++: Only reindent on electric characters if indent wasn't user-changed.

This should make the indenter less strict and annoying for non-standard
indentation styles.

Reviewed-by: Roberto Raggi

src/plugins/cppeditor/cppeditor.cpp

@@ -1494,13 +1494,21 @@ bool CPPEditor::isInComment(const QTextCursor &cursor) const
 void CPPEditor::indentBlock(QTextDocument *doc, QTextBlock block, QChar typedChar)
 {
     Q_UNUSED(doc)
-    Q_UNUSED(typedChar)
 
     const TabSettings &ts = tabSettings();
     CppTools::QtStyleCodeFormatter codeFormatter(ts);
 
     codeFormatter.updateStateUntil(block);
     const int depth = codeFormatter.indentFor(block);
+
+    // only reindent the current line when typing electric characters if the
+    // indent is the same it would be if the line were empty
+    if (isElectricCharacter(typedChar)) {
+        const int newlineIndent = codeFormatter.indentForNewLineAfter(block.previous());
+        if (ts.indentationColumn(block.text()) != newlineIndent)
+            return;
+    }
+
     ts.indentLine(block, depth);
 }
 

src/plugins/cpptools/cppcodeformatter.cpp

@@ -470,6 +470,12 @@ int CodeFormatter::indentFor(const QTextBlock &block)
     return m_indentDepth;
 }
 
+int CodeFormatter::indentForNewLineAfter(const QTextBlock &block)
+{
+    restoreCurrentState(block);
+    return m_indentDepth;
+}
+
 void CodeFormatter::updateStateUntil(const QTextBlock &endBlock)
 {
     QStack<State> previousState = initialState();

src/plugins/cpptools/cppcodeformatter.h

@@ -69,6 +69,7 @@ public:
     void updateLineStateChange(const QTextBlock &block);
 
     int indentFor(const QTextBlock &block);
+    int indentForNewLineAfter(const QTextBlock &block);
 
     void setTabSize(int tabSize);