Use Q_EMIT instead of emit

Continuing Ahmad Samir MR: !343
In C++20 there are new classes that have member functions named
emit().

src/Vt102Emulation.cpp

@@ -569,7 +569,7 @@ void Vt102Emulation::processToken(int token, int p, int q)
     case token_ctl('D'      ) : /* EOT: ignored                      */ break;
     case token_ctl('E'      ) :      reportAnswerBack     (          ); break; //VT100
     case token_ctl('F'      ) : /* ACK: ignored                      */ break;
-    case token_ctl('G'      ) : emit bell();
+    case token_ctl('G'      ) : Q_EMIT bell();
                                 break; //VT100
     case token_ctl('H'      ) : _currentScreen->backspace            (          ); break; //VT100
     case token_ctl('I'      ) : _currentScreen->tab                  (          ); break; //VT100
@@ -657,7 +657,7 @@ void Vt102Emulation::processToken(int token, int p, int q)
                                break;
 
 // change tab text color : \e[28;<color>t  color: 0-16,777,215
-    case token_csi_ps('t',   28) : emit changeTabTextColorRequest      ( p        );          break;
+    case token_csi_ps('t',   28) : Q_EMIT changeTabTextColorRequest      ( p        );          break;
 
     case token_csi_ps('K',   0) : _currentScreen->clearToEndOfLine     (          ); break;
     case token_csi_ps('K',   1) : _currentScreen->clearToBeginOfLine   (          ); break;
@@ -925,14 +925,14 @@ void Vt102Emulation::processToken(int token, int p, int q)
     // Set Cursor Style (DECSCUSR), VT520, with the extra xterm sequences
     // the first one is a special case, 'ESC[ q', which mimics 'ESC[1 q'
     // Using 0 to reset to default is matching VTE, but not any official standard.
-    case token_csi_sp ('q'    ) : emit setCursorStyleRequest(Enum::BlockCursor,     true);  break;
-    case token_csi_psp('q',  0) : emit resetCursorStyleRequest();                           break;
-    case token_csi_psp('q',  1) : emit setCursorStyleRequest(Enum::BlockCursor,     true);  break;
-    case token_csi_psp('q',  2) : emit setCursorStyleRequest(Enum::BlockCursor,     false); break;
-    case token_csi_psp('q',  3) : emit setCursorStyleRequest(Enum::UnderlineCursor, true);  break;
-    case token_csi_psp('q',  4) : emit setCursorStyleRequest(Enum::UnderlineCursor, false); break;
-    case token_csi_psp('q',  5) : emit setCursorStyleRequest(Enum::IBeamCursor,     true);  break;
-    case token_csi_psp('q',  6) : emit setCursorStyleRequest(Enum::IBeamCursor,     false); break;
+    case token_csi_sp ('q'    ) : Q_EMIT setCursorStyleRequest(Enum::BlockCursor,     true);  break;
+    case token_csi_psp('q',  0) : Q_EMIT resetCursorStyleRequest();                           break;
+    case token_csi_psp('q',  1) : Q_EMIT setCursorStyleRequest(Enum::BlockCursor,     true);  break;
+    case token_csi_psp('q',  2) : Q_EMIT setCursorStyleRequest(Enum::BlockCursor,     false); break;
+    case token_csi_psp('q',  3) : Q_EMIT setCursorStyleRequest(Enum::UnderlineCursor, true);  break;
+    case token_csi_psp('q',  4) : Q_EMIT setCursorStyleRequest(Enum::UnderlineCursor, false); break;
+    case token_csi_psp('q',  5) : Q_EMIT setCursorStyleRequest(Enum::IBeamCursor,     true);  break;
+    case token_csi_psp('q',  6) : Q_EMIT setCursorStyleRequest(Enum::IBeamCursor,     false); break;
 
     //FIXME: weird DEC reset sequence
     case token_csi_pe('p'      ) : /* IGNORED: reset         (        ) */ break;

src/terminalDisplay/TerminalDisplay.cpp

@@ -675,7 +675,7 @@ void TerminalDisplay::updateImage()
     }
 
     if (_scrollBar->highlightScrolledLines().isEnabled()) {
-        dirtyRegion |= emit highlightScrolledLinesRegion(dirtyRegion.isEmpty(), _scrollBar);
+        dirtyRegion |= Q_EMIT highlightScrolledLinesRegion(dirtyRegion.isEmpty(), _scrollBar);
     }
     _screenWindow->resetScrollCount();
 
@@ -2758,7 +2758,7 @@ void TerminalDisplay::dropEvent(QDropEvent* event)
             // plus an additional Paste option.
 
             QAction* pasteAction = new QAction(i18n("&Paste Location"), this);
-            connect(pasteAction, &QAction::triggered, this, [this, dropText]{ emit sendStringToEmu(dropText.toLocal8Bit());} );
+            connect(pasteAction, &QAction::triggered, this, [this, dropText]{ Q_EMIT sendStringToEmu(dropText.toLocal8Bit());} );
 
             QList<QAction*> additionalActions;
             additionalActions.append(pasteAction);

src/widgets/ViewContainer.cpp

@@ -76,7 +76,7 @@ TabbedViewContainer::TabbedViewContainer(ViewManager *connectedViewManager, QWid
     connect(tabBarWidget, &DetachableTabBar::closeTab,
         this, &TabbedViewContainer::closeTerminalTab);
     connect(tabBarWidget, &DetachableTabBar::newTabRequest,
-        this, [this]{ emit newViewRequest(); });
+        this, [this]{ Q_EMIT newViewRequest(); });
     connect(this, &TabbedViewContainer::currentChanged, this, &TabbedViewContainer::currentTabChanged);
 
     connect(this, &TabbedViewContainer::setColor, tabBarWidget, &DetachableTabBar::setColor);
@@ -99,7 +99,7 @@ TabbedViewContainer::TabbedViewContainer(ViewManager *connectedViewManager, QWid
     auto detachAction = _contextPopupMenu->addAction(
         QIcon::fromTheme(QStringLiteral("tab-detach")),
         i18nc("@action:inmenu", "&Detach Tab"), this,
-        [this] { emit detachTab(_contextMenuTabIndex); }
+        [this] { Q_EMIT detachTab(_contextMenuTabIndex); }
     );
     detachAction->setObjectName(QStringLiteral("tab-detach"));