visualfc · visualfc · Aug 12, 2026 · Aug 12, 2026 · Aug 12, 2026 · Aug 12, 2026
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -6,18 +6,36 @@ on:
 
 jobs:
   build:
-    name: Build (${{ matrix.os }})
+    name: Build (${{ matrix.os }}, Qt ${{ matrix.qt_version }})
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
         include:
           - os: ubuntu-latest
+            qt_version: '5.15.2'
             qt_arch: gcc_64
+            qt_modules: ''
           - os: macos-latest
+            qt_version: '5.15.2'
             qt_arch: clang_64
+            qt_modules: ''
           - os: windows-latest
+            qt_version: '5.15.2'
             qt_arch: win64_msvc2019_64
+            qt_modules: ''
+          - os: ubuntu-latest
+            qt_version: '6.8.3'
+            qt_arch: linux_gcc_64
+            qt_modules: qt5compat
+          - os: macos-latest
+            qt_version: '6.8.3'
+            qt_arch: clang_64
+            qt_modules: qt5compat
+          - os: windows-latest
+            qt_version: '6.8.3'
+            qt_arch: win64_msvc2022_64
+            qt_modules: qt5compat
 
     steps:
       - name: Check out source
@@ -33,39 +51,59 @@ jobs:
         if: runner.os == 'Linux'
         uses: jurplel/install-qt-action@v4
         with:
-          version: '5.15.2'
+          version: ${{ matrix.qt_version }}
           host: linux
           target: desktop
           arch: ${{ matrix.qt_arch }}
+          modules: ${{ matrix.qt_modules }}
           install-deps: true
           cache: true
 
       - name: Install Qt (macOS)
         if: runner.os == 'macOS'
         uses: jurplel/install-qt-action@v4
         with:
-          version: '5.15.2'
+          version: ${{ matrix.qt_version }}
           host: mac
           target: desktop
           arch: ${{ matrix.qt_arch }}
+          modules: ${{ matrix.qt_modules }}
           cache: true
 
       - name: Install Qt (Windows)
         if: runner.os == 'Windows'
         uses: jurplel/install-qt-action@v4
         with:
-          version: '5.15.2'
+          version: ${{ matrix.qt_version }}
           host: windows
           target: desktop
           arch: ${{ matrix.qt_arch }}
+          modules: ${{ matrix.qt_modules }}
           cache: true
 
-      - name: Set up MSVC
-        if: runner.os == 'Windows'
+      - name: Remove obsolete AGL dependency (Qt 6 macOS)
+        if: runner.os == 'macOS' && startsWith(matrix.qt_version, '6.')
+        shell: bash
+        run: |
+          qt_prefix="$(qmake -query QT_INSTALL_PREFIX)"
+          find "$qt_prefix" -type f \( -name '*.conf' -o -name '*.prf' -o -name '*.prl' \) \
+            -exec perl -pi -e 's/-framework AGL//g' {} +
+          if find "$qt_prefix" -type f \( -name '*.conf' -o -name '*.prf' -o -name '*.prl' \) \
+              -exec grep -l -- '-framework AGL' {} + | grep -q .; then
+            echo 'Failed to remove the obsolete AGL framework dependency.' >&2
+            exit 1
+          fi
+
+      - name: Set up MSVC 2019
+        if: runner.os == 'Windows' && startsWith(matrix.qt_version, '5.')
         uses: ilammy/msvc-dev-cmd@v1
         with:
           toolset: 14.29
 
+      - name: Set up MSVC 2022
+        if: runner.os == 'Windows' && startsWith(matrix.qt_version, '6.')
+        uses: ilammy/msvc-dev-cmd@v1
+
       - name: Configure (Linux)
         if: runner.os == 'Linux'
         shell: bash
@@ -80,7 +118,11 @@ jobs:
         run: |
           mkdir -p build-ci
           cd build-ci
-          qmake ../liteidex CONFIG+=release 'QMAKE_LIBS_OPENGL=-framework OpenGL'
+          qmake_args=(CONFIG+=release 'QMAKE_LIBS_OPENGL=-framework OpenGL')
+          if [[ '${{ matrix.qt_version }}' == 6.* ]]; then
+            qmake_args+=('QMAKE_CXXFLAGS+=-include arm_acle.h')
+          fi
+          qmake ../liteidex "${qmake_args[@]}"
 
       - name: Configure (Windows)
         if: runner.os == 'Windows'

diff --git a/liteidex/deploy/welcome/css/style.css b/liteidex/deploy/welcome/css/style.css
@@ -1,10 +1,10 @@
 body {
 	text-align: left;
 	margin: 0;
-	font-family: Helvetica, Arial, sans-serif;
+	font-family: Helvetica, Arial;
 }
 pre, code {
-	font-family: Menlo, monospace;
+	font-family: Menlo;
 }
 pre .comment {
 	color: #375EAB;

diff --git a/liteidex/liteidex.pri b/liteidex/liteidex.pri
@@ -19,6 +19,7 @@ isEmpty(IDE_LIBRARY_BASENAME) {
 }
 
 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport
+greaterThan(QT_MAJOR_VERSION, 5): QT += core5compat
 
 DEFINES += LITEAPP_LIBRARY
 

diff --git a/liteidex/src/3rdparty/cplusplus/BackwardsScanner.cpp b/liteidex/src/3rdparty/cplusplus/BackwardsScanner.cpp
@@ -117,10 +117,10 @@ QString BackwardsScanner::text(int index) const
     return _text.mid(firstToken.begin(), firstToken.length());
 }
 
-QStringRef BackwardsScanner::textRef(int index) const
+QStringView BackwardsScanner::textRef(int index) const
 {
     const Token &firstToken = _tokens.at(index + _offset);
-    return _text.midRef(firstToken.begin(), firstToken.length());
+    return QStringView(_text).mid(firstToken.begin(), firstToken.length());
 }
 
 int BackwardsScanner::size() const

diff --git a/liteidex/src/3rdparty/cplusplus/BackwardsScanner.h b/liteidex/src/3rdparty/cplusplus/BackwardsScanner.h
@@ -32,6 +32,7 @@
 #include "SimpleLexer.h"
 
 #include <QTextBlock>
+#include <QStringView>
 
 QT_FORWARD_DECLARE_CLASS(QTextCursor)
 
@@ -56,7 +57,7 @@ class BackwardsScanner
     QString mid(int index) const;
 
     QString text(int index) const;
-    QStringRef textRef(int index) const;
+    QStringView textRef(int index) const;
     // 1-based
     Token LA(int index) const;
 

diff --git a/liteidex/src/3rdparty/cplusplus/SimpleLexer.cpp b/liteidex/src/3rdparty/cplusplus/SimpleLexer.cpp
@@ -88,7 +88,7 @@ QList<Token> SimpleLexer::operator()(const QString &text, int state)
             break;
         }
 
-        QStringRef spell = text.midRef(lex.tokenOffset(), lex.tokenLength());
+        QStringView spell(text.constData() + lex.tokenOffset(), lex.tokenLength());
         lex.setScanAngleStringLiteralTokens(false);
 
         if (tk.f.newline && tk.is(T_POUND))

diff --git a/liteidex/src/3rdparty/diff_match_patch/diff_match_patch.cpp b/liteidex/src/3rdparty/diff_match_patch/diff_match_patch.cpp
@@ -23,6 +23,7 @@
 #include <QtCore>
 #include "liteapi/liteqt.h"
 #include "diff_match_patch.h"
+#include <QRegExp>
 
 
 //////////////////////////
@@ -65,7 +66,7 @@ QString Diff::strOperation(Operation op) {
 QString Diff::toString() const {
   QString prettyText = text;
   // Replace linebreaks with Pilcrow signs.
-  prettyText.replace('\n', L'\u00b6');
+  prettyText.replace(QLatin1Char('\n'), QChar(0x00b6));
   //qDebug(qPrintable(QString("Diff(") + strOperation(operation) + QString(",\"")
   //    + prettyText + QString("\")")));
   return QString("Diff(") + strOperation(operation) + QString(",\"")

diff --git a/liteidex/src/3rdparty/fakevim/fakevim/fakevimhandler.cpp b/liteidex/src/3rdparty/fakevim/fakevim/fakevimhandler.cpp
@@ -70,6 +70,8 @@
 #include <QPointer>
 #include <QProcess>
 #include <QRegExp>
+#include <QRegularExpression>
+#include <QStringRef>
 #include <QTextStream>
 #include <QTimer>
 #include <QStack>
@@ -426,7 +428,7 @@ static QRegExp vimPatternToQtPattern(QString needle, bool ignoreCaseOption, bool
      */
     // FIXME: Option smartcase should be used only if search was typed by user.
     bool ignorecase = ignoreCaseOption
-        && !(smartCaseOption && needle.contains(QRegExp(_("[A-Z]"))));
+        && !(smartCaseOption && needle.contains(QRegularExpression(_("[A-Z]"))));
     QString pattern;
     pattern.reserve(2 * needle.size());
 
@@ -543,6 +545,19 @@ static bool afterEndOfLine(const QTextDocument *doc, int position)
         && doc->findBlock(position).length() > 1;
 }
 
+static QTextCursor findRegExp(const QTextDocument *doc, const QRegExp &expression,
+                              const QTextCursor &cursor)
+{
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    return doc->find(expression, cursor);
+#else
+    QRegularExpression::PatternOptions options = QRegularExpression::NoPatternOption;
+    if (expression.caseSensitivity() == Qt::CaseInsensitive)
+        options |= QRegularExpression::CaseInsensitiveOption;
+    return doc->find(QRegularExpression(expression.pattern(), options), cursor);
+#endif
+}
+
 static void searchForward(QTextCursor *tc, QRegExp &needleExp, int *repeat)
 {
     const QTextDocument *doc = tc->document();
@@ -552,13 +567,13 @@ static void searchForward(QTextCursor *tc, QRegExp &needleExp, int *repeat)
     tc->movePosition(StartOfLine);
 
     // forward to current position
-    *tc = doc->find(needleExp, *tc);
+    *tc = findRegExp(doc, needleExp, *tc);
     while (!tc->isNull() && tc->anchor() < startPos) {
         if (!tc->hasSelection())
             tc->movePosition(Right);
         if (tc->atBlockEnd())
             tc->movePosition(NextBlock);
-        *tc = doc->find(needleExp, *tc);
+        *tc = findRegExp(doc, needleExp, *tc);
     }
 
     if (tc->isNull())
@@ -571,7 +586,7 @@ static void searchForward(QTextCursor *tc, QRegExp &needleExp, int *repeat)
             tc->movePosition(Right);
         if (tc->atBlockEnd())
             tc->movePosition(NextBlock);
-        *tc = doc->find(needleExp, *tc);
+        *tc = findRegExp(doc, needleExp, *tc);
         if (tc->isNull())
             return;
         --*repeat;
@@ -587,10 +602,10 @@ static void searchBackward(QTextCursor *tc, QRegExp &needleExp, int *repeat)
     QTextBlock block = tc->block();
     QString line = block.text();
 
-    int i = line.indexOf(needleExp, 0);
+    int i = needleExp.indexIn(line, 0);
     while (i != -1 && i < tc->positionInBlock()) {
         --*repeat;
-        i = line.indexOf(needleExp, i + qMax(1, needleExp.matchedLength()));
+        i = needleExp.indexIn(line, i + qMax(1, needleExp.matchedLength()));
         if (i == line.size())
             i = -1;
     }
@@ -603,10 +618,10 @@ static void searchBackward(QTextCursor *tc, QRegExp &needleExp, int *repeat)
         if (!block.isValid())
             break;
         line = block.text();
-        i = line.indexOf(needleExp, 0);
+        i = needleExp.indexIn(line, 0);
         while (i != -1) {
             --*repeat;
-            i = line.indexOf(needleExp, i + qMax(1, needleExp.matchedLength()));
+            i = needleExp.indexIn(line, i + qMax(1, needleExp.matchedLength()));
             if (i == line.size())
                 i = -1;
         }
@@ -617,9 +632,9 @@ static void searchBackward(QTextCursor *tc, QRegExp &needleExp, int *repeat)
         return;
     }
 
-    i = line.indexOf(needleExp, 0);
+    i = needleExp.indexIn(line, 0);
     while (*repeat < 0) {
-        i = line.indexOf(needleExp, i + qMax(1, needleExp.matchedLength()));
+        i = needleExp.indexIn(line, i + qMax(1, needleExp.matchedLength()));
         ++*repeat;
     }
     tc->setPosition(block.position() + i);
@@ -928,7 +943,7 @@ QString quoteUnprintable(const QString &ba)
         else if (cc == QLatin1Char('\n'))
             res += _("<CR>");
         else
-            res += QString::fromLatin1("\\x%1").arg(c.unicode(), 2, 16, QLatin1Char('0'));
+            res += QString::fromLatin1("\\x%1").arg(static_cast<uint>(c.unicode()), 2, 16, QLatin1Char('0'));
     }
     return res;
 }
@@ -1116,7 +1131,7 @@ class Input
             return QLatin1Char('\n');
         if (m_key == Key_Escape)
             return QChar(27);
-        return m_xkey;
+        return QChar(m_xkey);
     }
 
     QString toString() const
@@ -1310,7 +1325,7 @@ class CommandBuffer
         m_buffer = s; m_pos = m_userPos = pos; m_anchor = anchor >= 0 ? anchor : pos;
     }
 
-    QStringRef userContents() const { return m_buffer.leftRef(m_userPos); }
+    QStringRef userContents() const { return QStringRef(&m_buffer, 0, m_userPos); }
     const QChar &prompt() const { return m_prompt; }
     const QString &contents() const { return m_buffer; }
     bool isEmpty() const { return m_buffer.isEmpty(); }
@@ -2579,7 +2594,7 @@ void FakeVimHandler::Private::commitInsertState()
     lastInsertion.prepend(QString(_("<DELETE>")).repeated(insertState.deletes));
 
     // Remove indentation.
-    lastInsertion.replace(QRegExp(_("(^|\n)[\\t ]+")), _("\\1"));
+    lastInsertion.replace(QRegularExpression(_("(^|\n)[\\t ]+")), _("\\1"));
 }
 
 void FakeVimHandler::Private::invalidateInsertState()
@@ -2672,8 +2687,8 @@ void FakeVimHandler::Private::importSelection()
 
 void FakeVimHandler::Private::updateEditor()
 {
-    const int charWidth = QFontMetrics(EDITOR(font())).width(QLatin1Char(' '));
-    EDITOR(setTabStopWidth(charWidth * config(ConfigTabStop).toInt()));
+    const int charWidth = QFontMetrics(EDITOR(font())).horizontalAdvance(QLatin1Char(' '));
+    EDITOR(setTabStopDistance(charWidth * config(ConfigTabStop).toInt()));
     setupCharClass();
 }
 
@@ -2683,8 +2698,8 @@ void FakeVimHandler::Private::restoreWidget(int tabSize)
     //updateMiniBuffer();
     //EDITOR(removeEventFilter(q));
     //EDITOR(setReadOnly(m_wasReadOnly));
-    const int charWidth = QFontMetrics(EDITOR(font())).width(QLatin1Char(' '));
-    EDITOR(setTabStopWidth(charWidth * tabSize));
+    const int charWidth = QFontMetrics(EDITOR(font())).horizontalAdvance(QLatin1Char(' '));
+    EDITOR(setTabStopDistance(charWidth * tabSize));
     g.visualMode = NoVisualMode;
     // Force "ordinary" cursor.
     EDITOR(setOverwriteMode(false));
@@ -5384,7 +5399,7 @@ bool FakeVimHandler::Private::parseExCommmand(QString *line, ExCommand *cmd)
     cmd->cmd = line->mid(0, i).trimmed();
 
     // command arguments starts with first non-letter character
-    cmd->args = cmd->cmd.section(QRegExp(_("(?=[^a-zA-Z])")), 1);
+    cmd->args = cmd->cmd.section(QRegularExpression(_("(?=[^a-zA-Z])")), 1);
     if (!cmd->args.isEmpty()) {
         cmd->cmd.chop(cmd->args.size());
         cmd->args = cmd->args.trimmed();
@@ -5404,7 +5419,7 @@ bool FakeVimHandler::Private::parseExCommmand(QString *line, ExCommand *cmd)
 bool FakeVimHandler::Private::parseLineRange(QString *line, ExCommand *cmd)
 {
     // remove leading colons and spaces
-    line->remove(QRegExp(_("^\\s*(:+\\s*)*")));
+    line->remove(QRegularExpression(_("^\\s*(:+\\s*)*")));
 
     // special case ':!...' (use invalid range)
     if (line->startsWith(QLatin1Char('!'))) {
@@ -5463,7 +5478,7 @@ bool FakeVimHandler::Private::handleExSubstituteCommand(const ExCommand &cmd)
 
     int count = 1;
     QString line = cmd.args;
-    const int countIndex = line.lastIndexOf(QRegExp(_("\\d+$")));
+    const int countIndex = line.lastIndexOf(QRegularExpression(_("\\d+$")));
     if (countIndex != -1) {
         count = line.mid(countIndex).toInt();
         line = line.mid(0, countIndex).trimmed();
@@ -5611,8 +5626,8 @@ bool FakeVimHandler::Private::handleExMapCommand(const ExCommand &cmd0) // :map
         break;
     }
 
-    const QString lhs = args.section(QRegExp(_("\\s+")), 0, 0);
-    const QString rhs = args.section(QRegExp(_("\\s+")), 1);
+    const QString lhs = args.section(QRegularExpression(_("\\s+")), 0, 0);
+    const QString rhs = args.section(QRegularExpression(_("\\s+")), 1);
     if ((rhs.isNull() && type != Unmap) || (!rhs.isNull() && type == Unmap)) {
         // FIXME: Dump mappings here.
         //qDebug() << g.mappings;
@@ -8244,7 +8259,7 @@ bool FakeVimHandler::Private::changeNumberTextObject(int count)
 
     // convert hexadecimal number to upper-case if last letter was upper-case
     if (hex) {
-        const int lastLetter = num.lastIndexOf(QRegExp(_("[a-fA-F]")));
+        const int lastLetter = num.lastIndexOf(QRegularExpression(_("[a-fA-F]")));
         if (lastLetter != -1 && num[lastLetter].isUpper())
             repl = repl.toUpper();
     }
-Original file line number
+Diff line change
@@ Expand Up / @@ -19,6 +19,7 @@ isEmpty(IDE_LIBRARY_BASENAME) { @@
     }
     greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport
+    greaterThan(QT_MAJOR_VERSION, 5): QT += core5compat
     DEFINES += LITEAPP_LIBRARY
@@ Expand Down @@