Get rid of stale jump arrows in disassembly widget. (#3175)

This commit clears arrows from edited instructions, in order to avoid
stale arrows to remain drawn.

closes #3114

src/widgets/DisassemblyWidget.cpp

@@ -132,7 +132,7 @@ DisassemblyWidget::DisassemblyWidget(MainWindow *main)
     connect(Core(), &CutterCore::functionRenamed, this, [this]() { refreshDisasm(); });
     connect(Core(), SIGNAL(varsChanged()), this, SLOT(refreshDisasm()));
     connect(Core(), SIGNAL(asmOptionsChanged()), this, SLOT(refreshDisasm()));
-    connect(Core(), &CutterCore::instructionChanged, this, &DisassemblyWidget::refreshIfInRange);
+    connect(Core(), &CutterCore::instructionChanged, this, &DisassemblyWidget::instructionChanged);
     connect(Core(), &CutterCore::breakpointsChanged, this, &DisassemblyWidget::refreshIfInRange);
     connect(Core(), SIGNAL(refreshCodeViews()), this, SLOT(refreshDisasm()));
 
@@ -226,6 +226,12 @@ void DisassemblyWidget::refreshIfInRange(RVA offset)
     }
 }
 
+void DisassemblyWidget::instructionChanged(RVA offset)
+{
+    leftPanel->clearArrowFrom(offset);
+    refreshDisasm();
+}
+
 void DisassemblyWidget::refreshDisasm(RVA offset)
 {
     if (!disasmRefresh->attemptRefresh(offset == RVA_INVALID ? nullptr : new RVA(offset))) {
@@ -988,3 +994,12 @@ void DisassemblyLeftPanel::paintEvent(QPaintEvent *event)
 
     lastBeginOffset = lines.first().offset;
 }
+
+void DisassemblyLeftPanel::clearArrowFrom(RVA offset)
+{
+    auto it = std::find_if(arrows.begin(), arrows.end(),
+                           [&](const Arrow &it) { return it.jmpFromOffset() == offset; });
+    if (it != arrows.end()) {
+        arrows.erase(it);
+    }
+}

src/widgets/DisassemblyWidget.h

@@ -53,6 +53,7 @@ public slots:
 protected slots:
     void on_seekChanged(RVA offset);
     void refreshIfInRange(RVA offset);
+    void instructionChanged(RVA offset);
     void refreshDisasm(RVA offset = RVA_INVALID);
 
     bool updateMaxLines();
@@ -153,6 +154,7 @@ class DisassemblyLeftPanel : public QFrame
     DisassemblyLeftPanel(DisassemblyWidget *disas);
     void paintEvent(QPaintEvent *event) override;
     void wheelEvent(QWheelEvent *event) override;
+    void clearArrowFrom(RVA offset);
 
 private:
     DisassemblyWidget *disas;