Optimize the terminal output speed

ChangeLog

@@ -1,3 +1,6 @@
+2020-10-19  Markus Gans  <guru.mail@muenster.de>
+	* Optimize the terminal output speed
+
 2020-10-17  Markus Gans  <guru.mail@muenster.de>
 	* Fixes unit test segfault
 

examples/background-color.cpp

@@ -183,7 +183,6 @@ void Background::cb_changed()
                               , int(green.getValue())
                               , int(blue.getValue()) );
   redraw();
-  updateTerminal();
 }
 
 //----------------------------------------------------------------------
@@ -205,7 +204,6 @@ void Background::cb_choice()
                               , int(green.getValue())
                               , int(blue.getValue()) );
   redraw();
-  updateTerminal();
 }
 
 //----------------------------------------------------------------------

examples/calculator.cpp

@@ -335,7 +335,6 @@ void Calc::onKeyPress (finalcut::FKeyEvent* ev)
         }
 
         drawDispay();
-        updateTerminal();
       }
 
       ev->accept();
@@ -394,7 +393,6 @@ void Calc::cb_buttonClicked (Calc::button key)
   }
 
   drawDispay();
-  updateTerminal();
 
   if ( infix_operator && ! isDataEntryKey(key) )
     input = "";

examples/event-log.cpp

@@ -294,7 +294,6 @@ void EventLog::onTimer (finalcut::FTimerEvent*)
     str("");
     scrolltext.scrollToEnd();
     redraw();
-    updateTerminal();
   }
 }
 

examples/rotozoomer.cpp

@@ -225,7 +225,7 @@ void RotoZoomer::onShow (finalcut::FShowEvent*)
     for (path = 1; path < loops; path++)
     {
       redraw();
-      updateTerminal();
+      processTerminalUpdate();
     }
 
     end = system_clock::now();
@@ -244,8 +244,6 @@ void RotoZoomer::onTimer (finalcut::FTimerEvent*)
     path++;
 
   redraw();
-  updateTerminal();
-  flush();
 }
 
 //----------------------------------------------------------------------

examples/transparent.cpp

@@ -237,8 +237,6 @@ void MainWindow::draw()
 
   if ( finalcut::FTerm::isMonochron() )
     setReverse(false);
-
-  updateTerminal();
 }
 
 //----------------------------------------------------------------------

examples/ui.cpp

@@ -159,9 +159,6 @@ void ProgressDialog::onTimer (finalcut::FTimerEvent*)
 
   if ( getStatusBar() )
     getStatusBar()->drawMessage();
-
-  updateTerminal();
-  flush();
 }
 
 //----------------------------------------------------------------------

examples/windows.cpp

@@ -153,7 +153,6 @@ void SmallWindow::onTimer (finalcut::FTimerEvent*)
   top_right_label.redraw();
   bottom_label.unsetEmphasis();
   bottom_label.redraw();
-  updateTerminal();
   delOwnTimers();
 }
 
@@ -344,8 +343,6 @@ void Window::activateWindow (finalcut::FDialog* win) const
 
   if ( has_raised )
     win->redraw();
-
-  updateTerminal();
 }
 
 //----------------------------------------------------------------------

src/fapplication.cpp

@@ -971,9 +971,6 @@ void FApplication::unselectMenubarItems() const
 
     if ( FWidget::getStatusBar() )
       FWidget::getStatusBar()->drawMessage();
-
-    updateTerminal();
-    flush();
   }
 }
 
@@ -1290,13 +1287,13 @@ bool FApplication::processNextEvent()
   if ( is_timeout )
   {
     FObject::getCurrentTime (&time_last_event);
+    processTerminalUpdate();  // before user input
     processKeyboardEvent();
     processMouseEvent();
     processResizeEvent();
-    processTerminalUpdate();
+    processTerminalUpdate();  // after user input
     processCloseWidget();
     processLogger();
-    updateTerminal();
   }
 
   processExternalUserEvent();

src/fbusyindicator.cpp

@@ -50,8 +50,6 @@ void FBusyIndicator::start()
   running = true;
   createIndicatorText();
   show();
-  updateTerminal();
-  flush();
   addTimer(TIMER);
 }
 
@@ -61,8 +59,6 @@ void FBusyIndicator::stop()
   delOwnTimers();
   running = false;
   hide();
-  updateTerminal();
-  flush();
 }
 
 
@@ -119,8 +115,6 @@ void FBusyIndicator::onTimer (finalcut::FTimerEvent*)
   // Redraw the rotated pattern
   createIndicatorText();
   redraw();
-  updateTerminal();
-  flush();
 }
 
 }  // namespace finalcut

src/fbuttongroup.cpp

@@ -331,8 +331,6 @@ void FButtonGroup::onFocusIn (FFocusEvent* in_ev)
   if ( getStatusBar() )
   {
     getStatusBar()->drawMessage();
-    updateTerminal();
-    flush();
   }
 }
 
@@ -507,8 +505,6 @@ void FButtonGroup::directFocus()
   if ( getStatusBar() )
   {
     getStatusBar()->drawMessage();
-    updateTerminal();
-    flush();
   }
 }
 

src/fcombobox.cpp

@@ -102,8 +102,6 @@ void FDropDownListBox::hide()
   setOpenMenu(nullptr);
   const auto& t_geometry = getTermGeometryWithShadow();
   restoreVTerm (t_geometry);
-  updateTerminal();
-  flush();
 }
 
 
@@ -428,8 +426,6 @@ void FComboBox::onMouseDown (FMouseEvent* ev)
     else
       list_window.hide();
   }
-
-  updateTerminal();
 }
 
 //----------------------------------------------------------------------

src/fdialog.cpp

@@ -447,8 +447,6 @@ void FDialog::activateDialog()
 
   if ( getStatusBar() )
     getStatusBar()->drawMessage();
-
-  updateTerminal();
 }
 
 //----------------------------------------------------------------------
@@ -530,8 +528,7 @@ void FDialog::onMouseDown (FMouseEvent* ev)
   else  // ev->getButton() != fc::LeftButton
   {
     // Click on titlebar menu button
-    if ( ms.mouse_x < 4 && ms.mouse_y == 1
+    if ( ms.mouse_x < 4 && ms.mouse_y == 1 && dialog_menu->isShown() )
-      && dialog_menu->isShown() )
       leaveMenu();  // close menu
 
     cancelMouseResize();  // Cancel resize
@@ -690,8 +687,6 @@ void FDialog::onAccel (FAccelEvent*)
 
     if ( has_raised )
       redraw();
-
-    updateTerminal();
   }
 }
 
@@ -717,8 +712,6 @@ void FDialog::onWindowActive (FEvent*)
 
   if ( getStatusBar() )
     getStatusBar()->drawMessage();
-
-  updateTerminal();
 }
 
 //----------------------------------------------------------------------
@@ -1227,9 +1220,6 @@ void FDialog::leaveMenu()
 
   if ( getStatusBar() )
     getStatusBar()->drawMessage();
-
-  updateTerminal();
-  flush();
 }
 
 //----------------------------------------------------------------------
@@ -1273,9 +1263,6 @@ void FDialog::selectFirstMenuItem()
 
   if ( getStatusBar() )
     getStatusBar()->drawMessage();
-
-  updateTerminal();
-  flush();
 }
 
 //----------------------------------------------------------------------
@@ -1480,12 +1467,10 @@ inline void FDialog::raiseActivateDialog()
 //----------------------------------------------------------------------
 inline void FDialog::lowerActivateDialog()
 {
-  const bool has_lowered = lowerWindow();
+  lowerWindow();
 
   if ( ! isWindowActive() )
     activateDialog();
-  else if ( has_lowered )
-    updateTerminal();
 }
 
 //----------------------------------------------------------------------
@@ -1624,7 +1609,6 @@ void FDialog::cancelMouseResize()
 
   resize_click_pos.setPoint (0, 0);
   drawBorder();
-  updateTerminal();
 }
 
 //----------------------------------------------------------------------

src/flabel.cpp

@@ -205,11 +205,7 @@ void FLabel::onMouseDown (FMouseEvent* ev)
     accel_widget->redraw();
 
     if ( getStatusBar() )
-    {
       accel_widget->getStatusBar()->drawMessage();
-      updateTerminal();
-      flush();
-    }
   }
 }
 
@@ -232,11 +228,7 @@ void FLabel::onAccel (FAccelEvent* ev)
       FApplication::sendEvent(accel_widget, &in);
 
       if ( getStatusBar() )
-      {
         accel_widget->getStatusBar()->drawMessage();
-        updateTerminal();
-        flush();
-      }
     }
   }
 

src/flineedit.cpp

@@ -357,7 +357,7 @@ void FLineEdit::onKeyPress (FKeyEvent* ev)
     && key != fc::Fkey_enter )
   {
     drawInputField();
-    updateTerminal();
+    processTerminalUpdate();
   }
 }
 
@@ -397,7 +397,7 @@ void FLineEdit::onMouseDown (FMouseEvent* ev)
       adjustTextOffset();
 
     drawInputField();
-    updateTerminal();
+    processTerminalUpdate();
   }
 }
 
@@ -431,7 +431,7 @@ void FLineEdit::onMouseMove (FMouseEvent* ev)
 
     adjustTextOffset();
     drawInputField();
-    updateTerminal();
+    processTerminalUpdate();
   }
 
   // auto-scrolling when dragging mouse outside the widget
@@ -534,7 +534,7 @@ void FLineEdit::onTimer (FTimerEvent*)
 
   adjustTextOffset();
   drawInputField();
-  updateTerminal();
+  processTerminalUpdate();
 }
 
 //----------------------------------------------------------------------
@@ -554,11 +554,7 @@ void FLineEdit::onAccel (FAccelEvent* ev)
       redraw();
 
       if ( getStatusBar() )
-      {
         getStatusBar()->drawMessage();
-        updateTerminal();
-        flush();
-      }
     }
   }
 
@@ -584,11 +580,7 @@ void FLineEdit::onFocusIn (FFocusEvent*)
   }
 
   if ( getStatusBar() )
-  {
     getStatusBar()->drawMessage();
-    updateTerminal();
-    flush();
-  }
 }
 
 //----------------------------------------------------------------------

src/flistbox.cpp

@@ -352,8 +352,7 @@ void FListBox::onMouseDown (FMouseEvent* ev)
     if ( yoffset_before != yoffset )
       vbar->drawBar();
 
-    updateTerminal();
+    processTerminalUpdate();
-    flush();
   }
 }
 
@@ -426,8 +425,7 @@ void FListBox::onMouseMove (FMouseEvent* ev)
     if ( yoffset_before != yoffset )
       vbar->drawBar();
 
-    updateTerminal();
+    processTerminalUpdate();
-    flush();
   }
 
   // Auto-scrolling when dragging mouse outside the widget
@@ -504,8 +502,7 @@ void FListBox::onTimer (FTimerEvent*)
   if ( yoffset_before != yoffset )
     vbar->drawBar();
 
-  updateTerminal();
+  processTerminalUpdate();
-  flush();
 }
 
 //----------------------------------------------------------------------
@@ -547,8 +544,7 @@ void FListBox::onWheel (FWheelEvent* ev)
   if ( yoffset_before != yoffset )
     vbar->drawBar();
 
-  updateTerminal();
+  processTerminalUpdate();
-  flush();
 }
 
 //----------------------------------------------------------------------
@@ -1082,8 +1078,7 @@ inline void FListBox::updateDrawing (bool draw_vbar, bool draw_hbar)
   if ( draw_hbar )
     hbar->drawBar();
 
-  updateTerminal();
+  processTerminalUpdate();
-  flush();
 }
 
 //----------------------------------------------------------------------
@@ -1803,8 +1798,7 @@ void FListBox::cb_vbarChange (const FWidget*)
     if ( yoffset_before != yoffset )
       vbar->drawBar();
 
-    updateTerminal();
+    processTerminalUpdate();
-    flush();
   }
 }
 
@@ -1862,11 +1856,8 @@ void FListBox::cb_hbarChange (const FWidget*)
     inc_search.clear();
 
   if ( isShown() )
-  {
     drawList();
-    updateTerminal();
+
-    flush();
-  }
 
   if ( scrollType >= FScrollbar::scrollStepBackward )
   {
@@ -1875,8 +1866,7 @@ void FListBox::cb_hbarChange (const FWidget*)
     if ( xoffset_before != xoffset )
       hbar->drawBar();
 
-    updateTerminal();
+    processTerminalUpdate();
-    flush();
   }
 }
 

src/flistview.cpp

@@ -1116,8 +1116,7 @@ void FListView::onMouseDown (FMouseEvent* ev)
       if ( first_line_position_before != first_visible_line.getPosition() )
         vbar->drawBar();
 
-      updateTerminal();
+      processTerminalUpdate();
-      flush();
     }
   }
 }
@@ -1221,8 +1220,7 @@ void FListView::onMouseMove (FMouseEvent* ev)
     if ( first_line_position_before != first_visible_line.getPosition() )
       vbar->drawBar();
 
-    updateTerminal();
+    processTerminalUpdate();
-    flush();
   }
 
   // auto-scrolling when dragging mouse outside the widget
@@ -1308,8 +1306,7 @@ void FListView::onTimer (FTimerEvent*)
   if ( first_line_position_before != first_visible_line.getPosition() )
     vbar->drawBar();
 
-  updateTerminal();
+  processTerminalUpdate();
-  flush();
 }
 
 //----------------------------------------------------------------------
@@ -1347,8 +1344,7 @@ void FListView::onWheel (FWheelEvent* ev)
   if ( first_line_position_before != first_visible_line.getPosition() )
     vbar->drawBar();
 
-  updateTerminal();
+  processTerminalUpdate();
-  flush();
 }
 
 //----------------------------------------------------------------------
@@ -2152,8 +2148,7 @@ void FListView::updateDrawing (bool draw_vbar, bool draw_hbar)
   if ( draw_hbar )
     hbar->drawBar();
 
-  updateTerminal();
+  processTerminalUpdate();
-  flush();
 }
 
 //----------------------------------------------------------------------
@@ -2872,8 +2867,7 @@ void FListView::cb_vbarChange (const FWidget*)
     if ( first_line_position_before != first_visible_line.getPosition() )
       vbar->drawBar();
 
-    updateTerminal();
+    processTerminalUpdate();
-    flush();
   }
 }
 
@@ -2929,8 +2923,6 @@ void FListView::cb_hbarChange (const FWidget*)
   {
     drawHeadlines();
     drawList();
-    updateTerminal();
-    flush();
   }
 
   if ( scrollType >= FScrollbar::scrollStepBackward )
@@ -2940,8 +2932,7 @@ void FListView::cb_hbarChange (const FWidget*)
     if ( xoffset_before != xoffset )
       hbar->drawBar();
 
-    updateTerminal();
+    processTerminalUpdate();
-    flush();
   }
 }
 

src/fmenu.cpp

@@ -110,8 +110,6 @@ void FMenu::hide()
   FWindow::hide();
   const auto& t_geometry = getTermGeometryWithShadow();
   restoreVTerm (t_geometry);
-  updateTerminal();
-  flush();
 
   if ( ! isSubMenu() )
   {
@@ -206,9 +204,6 @@ void FMenu::onMouseDown (FMouseEvent* ev)
 
       if ( getStatusBar() )
         getStatusBar()->drawMessage();
-
-      updateTerminal();
-      flush();
     }
 
     return;
@@ -316,8 +311,7 @@ void FMenu::onMouseMove (FMouseEvent* ev)
   else if ( ms.hide_sub_menu )
   {
     closeOpenedSubMenu();
-    updateTerminal();
+    processTerminalUpdate();
-    flush();
   }
 }
 
@@ -615,9 +609,6 @@ void FMenu::openSubMenu (FMenu* sub_menu, bool select)
 
   if ( getStatusBar() )
     getStatusBar()->drawMessage();
-
-  updateTerminal();
-  flush();
 }
 
 //----------------------------------------------------------------------
@@ -728,9 +719,6 @@ void FMenu::mouseDownSubmenu (const FMenuItem* m_item)
 
     if ( getStatusBar() )
       getStatusBar()->drawMessage();
-
-    updateTerminal();
-    flush();
   }
 }
 
@@ -798,9 +786,6 @@ bool FMenu::mouseUpOverList (const FPoint& mouse_pos)
 
           if ( getStatusBar() )
             getStatusBar()->drawMessage();
-
-          updateTerminal();
-          flush();
         }
 
         return true;
@@ -1073,8 +1058,6 @@ bool FMenu::selectNextItem()
         getStatusBar()->drawMessage();
 
       redraw();
-      updateTerminal();
-      flush();
       break;
     }
 
@@ -1123,8 +1106,6 @@ bool FMenu::selectPrevItem()
         getStatusBar()->drawMessage();
 
       redraw();
-      updateTerminal();
-      flush();
       break;
     }
   }
@@ -1186,8 +1167,6 @@ bool FMenu::hotkeyMenu (FKeyEvent* ev)
           hideSubMenus();
           hide();
           hideSuperMenus();
-          updateTerminal();
-          flush();
           ev->accept();
           item->processClicked();
         }
@@ -1527,9 +1506,6 @@ inline void FMenu::selectPrevMenu (FKeyEvent* ev)
 
     if ( getStatusBar() )
       getStatusBar()->drawMessage();
-
-    updateTerminal();
-    flush();
   }
   else
     keypressMenuBar(ev);  // select previous menu
@@ -1600,9 +1576,6 @@ inline void FMenu::closeMenu()
 
   if ( getStatusBar() )
     getStatusBar()->drawMessage();
-
-  updateTerminal();
-  flush();
 }
 
 //----------------------------------------------------------------------

src/fmenubar.cpp

@@ -79,7 +79,6 @@ void FMenuBar::hide()
   FColor bg = wc->term_bg;
   setColor (fg, bg);
   print() << FPoint{1, 1} << FString{getDesktopWidth(), L' '};
-  updateTerminal();
   FWindow::hide();
 }
 
@@ -825,10 +824,7 @@ void FMenuBar::mouseDownOverList (const FMouseEvent* ev)
   }
 
   if ( focus_changed )
-  {
     redraw();
-    updateTerminal();
-  }
 }
 
 //----------------------------------------------------------------------
@@ -920,10 +916,7 @@ void FMenuBar::mouseMoveOverList (const FMouseEvent* ev)
   }
 
   if ( focus_changed )
-  {
     redraw();
-    updateTerminal();
-  }
 }
 
 //----------------------------------------------------------------------
@@ -972,8 +965,6 @@ void FMenuBar::leaveMenuBar()
   if ( getStatusBar() )
     getStatusBar()->drawMessage();
 
-  updateTerminal();
-  flush();
   mouse_down = false;
 }
 

src/fmenuitem.cpp

@@ -250,8 +250,6 @@ void FMenuItem::openMenu() const
   dd_menu->show();
   dd_menu->raiseWindow();
   dd_menu->redraw();
-  updateTerminal();
-  flush();
 }
 
 //----------------------------------------------------------------------

src/fprogressbar.cpp

@@ -64,8 +64,6 @@ void FProgressbar::setPercentage (std::size_t percentage_value)
     drawProgressLabel();
     drawProgressBar();
   }
-
-  updateTerminal();
 }
 
 //----------------------------------------------------------------------
@@ -126,8 +124,6 @@ void FProgressbar::reset()
     drawProgressLabel();
     drawProgressBar();
   }
-
-  updateTerminal();
 }
 
 
@@ -182,9 +178,6 @@ void FProgressbar::drawProgressBar()
 
   if ( FTerm::isMonochron() )
     setReverse(false);
-
-  updateTerminal();
-  flush();
 }
 
 //----------------------------------------------------------------------

src/fscrollbar.cpp

@@ -352,7 +352,7 @@ void FScrollbar::onMouseMove (FMouseEvent* ev)
     {
       setValue(new_val);
       drawBar();
-      updateTerminal();
+      processTerminalUpdate();
       processScroll();
     }
   }
@@ -757,7 +757,7 @@ void FScrollbar::jumpToClickPos (int x, int y)
   {
     setValue(new_val);
     drawBar();
-    updateTerminal();
+    processTerminalUpdate();
     scroll_type = FScrollbar::scrollJump;
     processScroll();
   }

src/fscrollview.cpp

@@ -411,7 +411,7 @@ void FScrollView::scrollTo (int x, int y)
 
   viewport->has_changes = true;
   copy2area();
-  updateTerminal();
+  processTerminalUpdate();
 }
 
 //----------------------------------------------------------------------

src/fspinbox.cpp

@@ -371,7 +371,6 @@ inline void FSpinBox::updateInputField()
   input_field << pfix << value << sfix;
   input_field.redraw();
   redraw();
-  updateTerminal();
 }
 
 //----------------------------------------------------------------------

src/fstatusbar.cpp

@@ -189,7 +189,6 @@ void FStatusBar::hide()
   const FColor bg = wc->term_bg;
   setColor (fg, bg);
   print() << FPoint{1, 1} << FString{getDesktopWidth(), L' '};
-  updateTerminal();
   FWindow::hide();
 }
 

src/fswitch.cpp

@@ -123,8 +123,6 @@ void FSwitch::draw()
   drawLabel();
   drawCheckButton();
   FToggleButton::draw();
-  updateTerminal();
-  flush();
 }
 
 //----------------------------------------------------------------------

src/ftextview.cpp

@@ -184,7 +184,7 @@ void FTextView::scrollTo (int x, int y)
   }
 
   drawText();
-  updateTerminal();
+  processTerminalUpdate();
 }
 
 //----------------------------------------------------------------------
@@ -328,7 +328,6 @@ void FTextView::clear()
             << FString{size, L' '};
   }
 
-  updateTerminal();
   processChanged();
 }
 
@@ -476,7 +475,7 @@ void FTextView::onWheel (FWheelEvent* ev)
   if ( isShown() )
     drawText();
 
-  updateTerminal();
+  processTerminalUpdate();
 }
 
 //----------------------------------------------------------------------
@@ -621,8 +620,6 @@ void FTextView::draw()
   }
 
   setCursorPos ({int(getWidth()), int(getHeight())});
-  updateTerminal();
-  flush();
 }
 
 //----------------------------------------------------------------------

src/ftogglebutton.cpp

@@ -222,11 +222,7 @@ void FToggleButton::onMouseDown (FMouseEvent* ev)
   redraw();
 
   if ( getStatusBar() )
-  {
     getStatusBar()->drawMessage();
-    updateTerminal();
-    flush();
-  }
 }
 
 //----------------------------------------------------------------------
@@ -299,11 +295,7 @@ void FToggleButton::onAccel (FAccelEvent* ev)
   redraw();
 
   if ( getStatusBar() )
-  {
     getStatusBar()->drawMessage();
-    updateTerminal();
-    flush();
-  }
 
   processClick();
   ev->accept();
@@ -474,10 +466,7 @@ void FToggleButton::onKeyPress (FKeyEvent* ev)
   }
 
   if ( ev->isAccepted() )
-  {
     draw();
-    updateTerminal();
-  }
 }
 
 

src/fvterm.cpp

@@ -183,9 +183,10 @@ void FVTerm::hideCursor (bool enable) const
 
   const char* visibility_str = FTerm::cursorsVisibilityString (enable);
 
-  if ( visibility_str )
+  if ( ! visibility_str )
-    appendOutputBuffer(visibility_str);
+    return;
 
+  appendOutputBuffer(visibility_str);
   flush();
 }
 
@@ -286,24 +287,8 @@ void FVTerm::updateTerminal() const
     }
   }
 
-  const auto& data = FTerm::getFTermData();
-
-  // Checks if the resizing of the terminal is not finished
-  if ( data && data->hasTermResized() )
-    return;
-
-  // Monitor whether the terminal size has changed
-  if ( isTermSizeChanged() )
-  {
-    raise (SIGWINCH);  // Send SIGWINCH
-    return;
-  }
-
-  // Update data on VTerm
-  updateVTerm();
-
   // Checks if VTerm has changes
-  if ( ! vterm->has_changes )
+  if ( ! hasPendingUpdates(vterm) )
     return;
 
   for (uInt y{0}; y < uInt(vterm->height); y++)
@@ -630,8 +615,12 @@ void FVTerm::flush()
   while ( ! output_buffer->empty() )
   {
     static const FTerm::defaultPutChar& FTermPutchar = FTerm::putchar();
-    FTermPutchar (output_buffer->front());
+
-    output_buffer->pop();
+    if ( FTermPutchar )
+    {
+      FTermPutchar (output_buffer->front());
+      output_buffer->pop();
+    }
   }
 
   std::fflush(stdout);
@@ -1283,7 +1272,23 @@ void FVTerm::processTerminalUpdate() const
   // Retains terminal updates if there are unprocessed inputs
   static constexpr int max_skip = 8;
 
-  if ( ! terminal_update_pending )
+  const auto& data = FTerm::getFTermData();
+
+  // Checks if the resizing of the terminal is not finished
+  if ( data && data->hasTermResized() )
+    return;
+
+  // Monitor whether the terminal size has changed
+  if ( isTermSizeChanged() )
+  {
+    raise (SIGWINCH);  // Send SIGWINCH
+    return;
+  }
+
+  // Update data on VTerm
+  updateVTerm();
+
+  if ( ! terminal_update_pending && ! hasPendingUpdates(vterm) )
     return;
 
   if ( ! keyboard->isInputDataPending() )
@@ -1652,7 +1657,7 @@ void FVTerm::updateVTerm() const
 {
   // Updates the character data from all areas to VTerm
 
-  if ( vdesktop && vdesktop->has_changes )
+  if ( hasPendingUpdates(vdesktop) )
   {
     putArea(vdesktop);
     vdesktop->has_changes = false;
@@ -1671,7 +1676,7 @@ void FVTerm::updateVTerm() const
     if ( ! (v_win && v_win->visible) )
       continue;
 
-    if ( v_win->has_changes )
+    if ( hasPendingUpdates(v_win) )
     {
       putArea(v_win);
       v_win->has_changes = false;
@@ -2941,6 +2946,12 @@ inline bool FVTerm::isTermSizeCheckTimeout()
   return FObject::isTimeout (&last_term_size_check, term_size_check_timeout);
 }
 
+//----------------------------------------------------------------------
+inline bool FVTerm::hasPendingUpdates (FTermArea* area)
+{
+  return ( area && area->has_changes ) ? true : false;
+}
+
 //----------------------------------------------------------------------
 inline void FVTerm::markAsPrinted (uInt pos, uInt line)
 {

src/fwidget.cpp

@@ -905,11 +905,7 @@ void FWidget::redraw()
     finishTerminalUpdate();
 
   if ( redraw_root_widget == this )
-  {
-    updateTerminal();
-    flush();
     redraw_root_widget = nullptr;
-  }
 }
 
 //----------------------------------------------------------------------
@@ -976,8 +972,6 @@ void FWidget::show()
   if ( show_root_widget && show_root_widget == this )
   {
     finishTerminalUpdate();
-    updateTerminal();
-    flush();
     show_root_widget = nullptr;
   }
 
@@ -1953,8 +1947,6 @@ bool FWidget::changeFocus ( FWidget* follower, FWidget* parent
     {
       redraw();
       follower->redraw();
-      updateTerminal();
-      flush();
     }
   }
 

src/fwindow.cpp

@@ -929,9 +929,6 @@ void closeDropDown (const FWidget* widget, const FPoint& mouse_position)
 
   if ( FWidget::getStatusBar() )
     FWidget::getStatusBar()->drawMessage();
-
-  widget->updateTerminal();
-  FVTerm::flush();
 }
 
 }  // namespace finalcut

src/include/final/fvterm.h

@@ -340,7 +340,7 @@ class FVTerm
 
     // Constants
     //   Buffer size for character output on the terminal
-    static constexpr uInt TERMINAL_OUTPUT_BUFFER_SIZE = 32768;
+    static constexpr uInt TERMINAL_OUTPUT_BUFFER_SIZE = 131072;
 
     // Methods
     void                  resetTextAreaToDefault ( const FTermArea*
@@ -417,6 +417,7 @@ class FVTerm
     bool                  isInsideTerminal (const FPoint&) const;
     bool                  isTermSizeChanged() const;
     static bool           isTermSizeCheckTimeout();
+    static bool           hasPendingUpdates (FTermArea*);
     static void           markAsPrinted (uInt, uInt);
     static void           markAsPrinted (uInt, uInt, uInt);
     static void           newFontChanges (FChar*&);