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 New or improved components:
 * Transistors (NPN and PNP).
 * Inductor.
 * Ideal opamp.
 * Rotary switch.
 * Bus connection.
 * Matrix display and driver.
 * Magnitude comparator.
 * Voltage and current probes for oscilloscope.
 * Simulated bouncing for switches.
 * Serial and parallel port components (interface with computer hardware).
 
 Project Management:
 * Complete rewrite...
 * Support for building targets, with processing and linking options.
 
 FlowCode / Microbe:
 * Can read from keypads and display on seven segment displays.
 * Add warning for floating connections in FlowCode.
 * Generated assembly is now heavily optimized.
 
 Debugging:
 * High level language support (SDCC, Microbe).
 * Mouse-over variable inspection.
 * Symbol Viewer.
 
 Optimization:
 * Cache simulation data for circuits with discrete set of inputs (and no
   reactive components).
 * Speed up calculation of diode operating point.
 * Optimized mixed logic and non-logic simulation.
 * Optimized recording of boolean data from logic probes.
 
 Interface:
 * Translations into French, Spanish and Italian.
 * Replaced KMDI with KateMDI (toolviews remember sizes, lots of other
   improvements).
 * Modularised GUI - menus and toolbars are hidden / shown as appropriate for
   the document being edited.
 * Toolbar item editor is now squashable.
 * Lots of icon improvements.
 
 Polishing:
 * Removed flicker when resizing the work area.
 * Remember cursor position in text documents on save / restore.
 * Removed flicker when joining / splitting connectors.
 * Save undo / redo state after editing data.
 * Remember connection routing selection.
 * Try and retain upwards position of text when rotating / reflecting components.
 * Editing of real numbers now always uses three significant figures.
 * Give LEDs a nice selection of predefined LED colours.
 
 Miscellaneous Features:
 * PIC program uploading (via the use of external programs).
 * Allow changing of the z-ordering of items.
 * Added support for gpsim-0.21.11 and gpsim-0.21.12.
 
 Changes between Qt3 and Qt4 port (to be completed)
 ====
 - ktechlab compiles and runs with Qt4 and kdelibs4
 - fixed crash on item drag to circuit, if the item is held less than ~1s over the circuit (if it is, then dragging appears to work)
     - caused by timing condition, related to dragging explicit event consumption in the application
 - added flexible logging system
 - fixed removing of subcircuits from component list
 - removed: delete subcircuit with the delete key
     - can be readded as a feature
 - fix to allow changing the name of an external connector
 - fixed graphical glitches with external components; caused by a painter used for taking font metrics
 - fixed use-after free crash in ECSRFlipFlop::inStateChanged(), when SR flipflops are added and removed subsequenctly to a circuit
 - fixed possible graphical glitches on color selecting widget
 - fixed crash when closing ktechlab with probes placed on a circuit
 - fixed button for inserting DrawParts (text, arrow, rectangle, etc.) in circuits and in flowcode
 - fixed pressing cancel in the new.. dialog; now it does work
 - fixed with a hard-coded limit: I think the 'scope just keeps filling data points into RAM,
     because RAM usage climbs steadily until the virtual machine crashes (same as the kde3 version)
     - would be useful to set a reasonable limit for the data points, initially hardcoded, to be made configurable in the future
     - for now limit is hard-coded, the probe data flats-out when limit is reached; memory usage does not increase to infinity
 - fixed crash on File -> Quit
 - fixed some missing icons: attach blockdevice cancel contents exec fileclose fileopen filesave log reload source source_c
     stop view_bottom view_right window_new
     button_cancel down fileexport pencil player_pause player_play project_open rotate rotate_ccw rotate_cw
     editdelete
     text_block     text_center     text_left     text_right     text_sub     text_super
     align_horizontally -> align-horizontal-center (oxygen)
     align_vertically -> align-vertical-center (oxygen)
     distribute_horizontally -> distribute-horizontal-x (oxygen)
     distribute_vertically -> distribute-vertical-y (oxygen)
     file_export_image -> document-export
     fileimport -> document-import
     imagegallery -> insert-image
     launch -> run-build (doxygen)
     paintbrush -> draw-brush (doxygen)
     rightjust -> format-justify-right (doxygen)
     routing_mode_auto -- not actually used
     routing_mode_manual -- not actually used
 - fixed missing icons:
     - some icons are distributed inside the kde3 icons; find them there and install them under ktechlab icons
     ktechlab_mechanics - not actually used
     null - false positive
 - add licence information about 3rd party icons
 - fixed: when creating new project, ok/cancel does not work
 - fixed: when creating a project, ktechlab crashes
 - fixed more icons
     memory.png -> network-connect
     gplink.png -> merge
 - fixed signal TextDocument::slotSelectionmChanged() -> KTextEditor::View::slotSelectionmChanged(KTextEditor::View*)
 - when launching mircobe, also look in the installation prefix of ktechlab first.
     should fix "convert to microbe" when ktechlab is not in PATH
     - added fix into the run-simple.sh and run-developer.sh scripts; for installs in the PATH,
         this should not be needed
 - fixed loading PIC program through the toolbar button; in property editor it works
 - fixed converting C program to Assembly/Hex. Note that need to enable in GPLink options "Link with shared libs"
     error with __sdcc_gsinit_startup
     note: sdcc is broken in Debian/Ubuntu for PICs: https://bugs.launchpad.net/ubuntu/+source/sdcc/+bug/1077918
 - fixed: when loading program to PIC, "all supported file types" is not valid
 - fixed: converting C code to hex if destination file does not exist
 - fixed GPLink options pane is broken; GUI needs fixing; added layout to the widget
 - fixed: SDCC "other options" is not a list, but 1 huge option
     sdcc --foo --bar
     vs
     sdcc '--foo --bar' <- this is not correct
 - fixed: when editing source code, many keyboard shortcuts are signaled as duplicate
     KTextEditor creates its own KActions, and those interfered with the KTechLab created ones
 - fixed printing of text documents
 - could not reproduce anymore: when editing source code, many nonexitent signals are used in the code
 - fixed: SDCC should have an option to enable non-free libraries/includes
 - fixed: SDCC should have an option to set extra SDCC's install prefix
 - not needed: GPLink should have an option to set the libraries' path -- it takes libraries from SDCC install prefix
 - cannot convert C code to ASM or HEX, because function __sdcc_gsinit_startup
     - need to set proper sdcclib when linking; to be automatized
     - sdcc's libraries should be properly installed
 - reviewed: cannot compile code for PIC, because SDCC complains about the PIC identifier
     - pic16f84 works; others are not clear
     - gpsim pic list: gpsim ; processor list
     - sdcc pic list: touch foo.c ;
         sdcc -mpic14 -phelp foo.c
         sdcc -mpic16 -phelp --verbose foo.c
     - some PICs are not supported by SDCC
 - fixed: new file toolbar button / file menu entry should appear on the toolbar by default
 - could not reproduce: GFX error on e.g. LED in that I can't connect a wire unless I rotate the part.
 - could not reproduce: gfx errors that leaves gaps at connection points on components.
   (see last email with attached screen shot)
 - could not reproduce: some components get their connectors moved, thus (1) graphical issues, (2) impossibility of connecting connectors results
 - could not reproduce: (from Claus) There are some other gfx glitches, but that might be because I run it in a virtual machine - 
     didn't have them on the previous builds though.
 - could not reproduce: 'Scope works well, but doesn't clear 'lines' from other circuits when they are closed. (Y-axis scale would be nice)
 - not important for now: new file toolbar button / file menu entry should show the new file dialog;
     it is usable as it is
 - fix build on kubuntu 64 bit, for all combinations of installed/not installed state of gpsim/glib
     - when both (gpsim-dev and libglib2.0-dev) are installed or both are uninstalled, then ktechlab compiles and runs fine (kubunt 16.04)
 - fixed: when placing a component with slider, and clicking on the slider, the
   slider follows the mouse cursor even after it is released; this is annyoing
 * release 0.40.0
 - use QMenu instead of Q3PopupMenu
 - use QTextEdit instead of K3TextEdit
 - fix export as image to not generate black rectangle around exported images
 - do not depend ot KDE3 support libraries, only on KDE4 libraries; Qt3Support is still needed
 - fix crash on Redo in Pin Map Editor
 - fix UI files to not use Q3* functionality
 - ported item selector
     - Q3ListView -> QTreeWidget
 - ported project manager
     - Q3ListView -> QTreeWidget
 - Q3PaintDeviceMetrics -> QPrinter->pageRect()
 - canvas.h: split up huge file
 - copy the Q3ScrollView into source tree and use that, as internal source code
 - use Q3PointArray -> QPolygon
 - use Q3ListView -> QTableWidget
 - Q3ScrollView -> use internal copy for now
 - Q3Hbox -> QWidget, QHBoxLayout
 - Q3SimpleRichText -> QTextEdit
 - use Q3PtrVector -> QVector< T * >
 - disable explicit double buffering when drawing; should fix build for OSX
 - ktlq3support:
     - removed dependency on:
         - q3ptrdict
         - q3ptrlist
 - removed Qt3 dependencies
     - enable compilation warnings on deprecated Qt functionalities, remove those
     - read this: http://doc.qt.io/qt-4.8/porting4.html
 - got rid of Qt3Support dependency
 - integrated changes needed for build on OS X, see emails
 - fix: on 'no item selected', the old properties still remain there
 - fixed resizing of QTextEdit to minimal needed size for rendering
 - validated that rich text editor continues to work correctly (see the context help of the components)
     - in editing mode pictures did not appear; fixed now
 - fixed color of text / background in property editor
 - fixed bidirectional led color editor
 - property editor is good enough for now
 * release 0.40.1
 - ContextHelp::setContextHelp() needs fixing, crashes on m_pBrowser->end()
     - has not crashed as of current git master on Ubuntu 18.04
 - text hint interface needs fixing -- updated usage
 - fix building of the core library first; otherwise missing include file (ktlconfig.h) error could happen at build time
     - the build-scripts have a work-around, and based on that, building should be straight-forward
     - fixed, all sources are built into one big library, no multiple smaller libraries
 * release 0.50.0