Qml Debugger: Do not focus the current frame when adding a watch

The other debuggers do not cause the view to jump to the current frame
when adding a watch. Make the Qml debugger also not do this.

This is done in a slightly hacky way by preventing the gotoLocation of
the next handleFrame call to be executed. Ideally, the logic to
retrieve the value of locals should be separated from the logic to jump
to a specific frame. Right now the jump is implicit when updating the
locals.

Fixes: QTCREATORBUG-29329
Change-Id: I4b8f5c99ae41c92c3394f86da481303d4765f897
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

src/plugins/debugger/debuggerengine.cpp

@@ -2411,6 +2411,7 @@ void DebuggerEngine::updateWatchData(const QString &iname)
     // e.g. when changing the expression in a watcher.
     UpdateParameters params;
     params.partialVariable = iname;
+    params.qmlFocusOnFrame = false;
     doUpdateLocals(params);
 }
 

src/plugins/debugger/debuggerengine.h

@@ -214,6 +214,7 @@ public:
     }
 
     QString partialVariable;
+    bool qmlFocusOnFrame = true; // QTCREATORBUG-29874
 };
 
 class Location

src/plugins/debugger/qml/qmlengine.cpp

@@ -141,7 +141,7 @@ public:
     void evaluate(const QString expr, qint64 context, const QmlCallback &cb);
     void lookup(const LookupItems &items);
     void backtrace();
-    void updateLocals();
+    void updateLocals(bool focusOnFrame = true);
     void scope(int number, int frameNumber = -1);
     void scripts(int types = 4, const QList<int> ids = QList<int>(),
                  bool includeSource = false, const QVariant filter = QVariant());
@@ -216,6 +216,8 @@ public:
 
     FileInProjectFinder fileFinder;
 
+    bool skipFocusOnNextHandleFrame = false;
+
 private:
     ConsoleItem *constructLogItemTree(const QmlV8ObjectData &objectData, QList<int> &seenHandles);
     void constructChildLogItems(ConsoleItem *item, const QmlV8ObjectData &objectData,
@@ -791,7 +793,7 @@ void QmlEngine::assignValueInDebugger(WatchItem *item,
             StackHandler *handler = stackHandler();
             QString exp = QString("%1 = %2;").arg(expression).arg(value.toString());
             if (handler->isContentsValid() && handler->currentFrame().isUsable()) {
-                d->evaluate(exp, -1, [this](const QVariantMap &) { d->updateLocals(); });
+                d->evaluate(exp, -1, [this](const QVariantMap &) { d->updateLocals(false); });
             } else {
                 showMessage(Tr::tr("Cannot evaluate %1 in current stack frame.")
                             .arg(expression), ConsoleOutput);
@@ -941,8 +943,7 @@ void QmlEngine::quitDebugger()
 
 void QmlEngine::doUpdateLocals(const UpdateParameters &params)
 {
-    Q_UNUSED(params)
-    d->updateLocals();
+    d->updateLocals(params.qmlFocusOnFrame);
 }
 
 Context QmlEngine::languageContext() const
@@ -1292,13 +1293,14 @@ void QmlEnginePrivate::backtrace()
     runCommand(cmd, CB(handleBacktrace));
 }
 
-void QmlEnginePrivate::updateLocals()
+void QmlEnginePrivate::updateLocals(bool focusOnFrame)
 {
     //    { "seq"       : <number>,
     //      "type"      : "request",
     //      "command"   : "frame",
     //      "arguments" : { "number" : <frame number> }
     //    }
+    skipFocusOnNextHandleFrame = focusOnFrame;
 
     DebuggerCommand cmd(FRAME);
     cmd.arg(NUMBER, stackIndexLookup.value(engine->stackHandler()->currentIndex()));
@@ -2136,7 +2138,9 @@ void QmlEnginePrivate::handleFrame(const QVariantMap &response)
         currentFrameScopes.append(scopeIndex);
         this->scope(scopeIndex);
     }
-    engine->gotoLocation(stackHandler->currentFrame());
+
+    if (skipFocusOnNextHandleFrame)
+        engine->gotoLocation(stackHandler->currentFrame());
 
     // Send watchers list
     if (stackHandler->isContentsValid() && stackHandler->currentFrame().isUsable()) {