FakeVim: Assume UTF-8 for source also on Windows by default

... but make it configurable.

Fixes: QTCREATORBUG-29320
Change-Id: Ib377c78e51afb7d06167c66306250a281aa9279c
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/fakevim/fakevimactions.cpp

@@ -94,6 +94,7 @@ FakeVimSettings::FakeVimSettings()
     setup(&showCmd,        true,  "ShowCmd",        "sc",  Tr::tr("Show partial command"));
     setup(&relativeNumber, false, "RelativeNumber", "rnu", Tr::tr("Show line numbers relative to cursor"));
     setup(&blinkingCursor, false, "BlinkingCursor", "bc",  Tr::tr("Blinking cursor"));
+    setup(&systemEncoding, false, "SystemEncoding", {},    Tr::tr("Use system encoding for :source"));
     setup(&scrollOff,      0,     "ScrollOff",      "so",  Tr::tr("Scroll offset:"));
     setup(&backspace,      "indent,eol,start",
                                   "Backspace",      "bs",  Tr::tr("Backspace:"));
@@ -149,7 +150,8 @@ FakeVimSettings::FakeVimSettings()
                 showCmd,
                 startOfLine,
                 passKeys,
-                blinkingCursor
+                blinkingCursor,
+                HostOsInfo::isWindowsHost() ? LayoutItem(systemEncoding) : empty
             },
             Column {
                 incSearch,

src/plugins/fakevim/fakevimactions.h

@@ -151,6 +151,7 @@ public:
     FvBoolAspect emulateSurround;
 
     FvBoolAspect blinkingCursor;
+    FvBoolAspect systemEncoding;
 
 private:
     void setup(FvBaseAspect *aspect, const QVariant &value,

src/plugins/fakevim/fakevimhandler.cpp

@@ -6625,7 +6625,8 @@ bool FakeVimHandler::Private::handleExSourceCommand(const ExCommand &cmd)
         } else if (!line.isEmpty() && !inFunction) {
             //qDebug() << "EXECUTING: " << line;
             ExCommand cmd;
-            QString commandLine = QString::fromLocal8Bit(line);
+            QString commandLine = s.systemEncoding() ? QString::fromLocal8Bit(line)
+                                                     : QString::fromUtf8(line);
             while (parseExCommand(&commandLine, &cmd)) {
                 if (!handleExCommandHelper(cmd))
                     break;