(svn r7637) -Codechange: Change ShowQueryString to use a window pointer as a parent. If the
query has no parent (eg give money, rename waypoint), the global function
HandleOnEditText is used.

(svn r7473) -Fix (r7269): Pass a cargo type to determine the freight weight
multiplier instead of a vehicle. Fixes incorrect display of total
train capacity.

(svn r7415) -Codechange: Don't use typedef enum for simple widget enumerators when we will never use
their type anyways.

(svn r7330) -Fix (r7304): Data invalidation doesn't always happen as the local
player, resulting in an empty vehicle purchase list. Specify the player
as an argument to IsEngineBuildable()

(svn r7315) -Fix: Have the first engine in the list be selected once again when the window is opened
and remove a useless loop that tested if selected engine is still in list (moved to list
generation).

(svn r7313) -Codechange: Calling invalidate data on a window will surely warrant a redraw, so call
that after the WE_INVALIDATE_DATA event and remove (some of) the superflouous calls.

(svn r7299) -CodeChange: Train and Aircraft Build window GUI code simplified a bit:
- using one engine list instead of 3
- removed engine filters (loco, wagons, helicopters, etc.)
- EngineList code isolated from GUI (moved to helpers.cpp - reusing CBlobT code which does exactly what is needed for EngineList)
- removed unnecessary "optimization" (rebuild and sort engine list on each WE_PAINT)

(svn r7205) -Fix [FS#350, SF#1560913]: Window allocation and deletion messed with the actual window
structs inside their array, and possibly invalidating pointers higher up.
Meaning that any function called within an wndproc could cause unknown/invalid pointers
once control was returned to this function. Solved by the introduction of an extra
abstraction layer, an array of z-window positions that is only concerned with the
pointers.

(svn r6926) -Codechange: Rename WWT_4 to WWT_TEXTBTN_2 and WWT_6 to WWT_INSET (credits to peter1138
for the aptly found name)
-Codechange: Remove the explicit numbering from WindowWidgetTypes

(svn r6925) -Codechange: Be more strict with widget distinctions. WWT_PANEL is only plain panel,
WWT_IMGBTN must contain an image for drawing. Renamed WWT_PANEL_2 to WWT_IMGBTN_2
because that is what it is. Added WWT_PUSHBTN that is either just a pushable button,
or a textbutton, which text's drawn dynamically independent of widget.

(svn r6884) -Codechange: Add strict bounds checking in string formatting system.
The last parameter should point to the end of the buffer (eg lastof(buf))
Courtesy of Tron.

(svn r6760) -Codechange: Do a case insensitive sort of train engine names and just normally
check a boolean; no special magic needed

(svn r6714) -Codechange: replaced a direct manipulation of windows with InvalidateWindowData() in rail_cmd.c
Moved the actual modification of railtype to WE_INVALIDATE_DATA in the train depot handler
-Codechange: added SetWindowDirty() to WE_INVALIDATE_DATA as it made no sense to update the list without making the window dirty

(svn r6709) -Fix r6679: [build train window] solved an issue that could lead to trailing empty blocks in the list array
Since they were freed with the rest of the array, it only meant that we wasted a few bytes (max 16) while the window were open and we didn't leak memory

(svn r6707) -Feature: [build aircraft window] added buttons to view propeller planes, jet planes or helicopters
-Codechange: the build aircraft window now generates 3 malleced lists and displays based on those list
This is preparation for sorting aircraft

(svn r6681) -Fix: when vehicles never expire they will stay at peak reliability instead of the lowest to make them useful even when old
-Fix: when retiring an engine design, invalidate the build windows and invalidate the build window data
-Fix: mark build windows dirty when engine reliability changes

(svn r6679) -Feature: [train build window] added filter for wagons, engines or both in the display
-Codechange: [train build window] to get rid of a really ugly hack, the train build list is now generated in one loop and stored in an array

(svn r6624) -Feature: added ability to add refit commands to vehicle orders (can only be done in goto depot orders)
Example: make a train transport iron ore from A to B, then it visits a depot and refits to steel
It then transport steel back to A or near A if there is a factory and then it visits another depot to refit to iron ore again

This is controlled in the orders. If a goto depot order is lightlighted, then "Unload" changes to "Refit"
Control click "Refit" removes the refit part of the order (as the tooltip says)
The player will still pay the normal refit costs

Known issues:
If a vehicle is not in a depot, then the refit window will fail to tell refitted cargo capacity
Refit costs in the refit window can sometimes print 0 when it should not because the refit calculation is unaware that the vehicle will be refitted in between

Warning: autoreplace got a protection against replacing something so you get a new cargo type, but it can fail here. In the iron ore/steel example, it can see that
the vehicle carries iron ore and the new one can be refitted to iron ore, then it will replace. It will not check to see that it's valid for steel as well.
This is something to look into in the future

(svn r6619) -Codechange: Use accessors for disabled_state.
Another step toward merging XTDwidget.
The only two files not converted (window.h and widget.c) will be done at the very last commit)

(svn r6612) -Codechange: Use accessors for hidden_state.
Another step toward merging XTDwidget.
The only two files not converted (window.h and widget.c) will be done at the very last commit)

(svn r6562) -Codechange: merged the vehicle list window widget arrays
It made no sense to maintain 8 nearly identically arrays when a single one can do the job
Also made the two buttons always use half of the bottom width each, even when resizing

(svn r6518) -Codechange: unified the vehicle refit windows
This was requested by peter1138

(svn r6513) -Codechange: unified the code to draw depot windows
This change is intended to make it easier to make depot behaviour consistent
and faster to code when adding more features in the future
The user interface should hopefully not be affected by this

(svn r6503) -Codechange: added a function to tell what vehicles a depot contains
This will ensure that you can always get the same list when checking for vehicles in a depot (no need to duplicate code for each place, that needs such a list)
Since the vehicles are only looped once for each redraw, drawing speed is around twice as fast (measured to be 114%-121% faster depending on the number of vehicles in the game)

(svn r6497) -Fix r6165: Vehicles heading for depots when their orders contained "service in depot" displayed the stopping in depot string
This turned out to be due to OFB_HALT_IN_DEPOT and OFB_SERVICE_IF_NEEDED using the same bit
It appears that it doesn't matter for the code, so I adapted the string selection code to handle this

(svn r6353) -Codechange: Make DestinationID a typedef of uin16, which is as large as any type of destinataion (StationID, DepotID, WaypointID) it can hold
DestinationID being a union of these types is just hassle without benefit and cannot be handled correctly everywhere because of local lack of information

(svn r6350) -Codechange: moved some setup stuff into WE_CREATE in PlayerVehWndProc()
This is possible now that the window number is known when running WE_CREATE and it's a nicer solution

(svn r6291) -Feature: Vehicle lists from the station window now also got the goto depot button
-Codechange: unified the code for mass goto depot to avoid duplicated code
-Fix: Vehicles already on the way to depots will not be cancelled by mass goto depot (made it really hard to send all vehicles at once)

(svn r6280) -Codechange: Use the same naming for trains as for other vehicles:
CMD_SEND_TRAIN_TO_DEPOT instead of CMD_TRAIN_GOTO_DEPOT

(svn r6239) -Code cleanup: cleaned up PlayerVehWndProc
code to delete an empty shared orders list is now much simpler
cleaned up the code to handle button clicks
fixed an assert if widget 9 was pressed on a list with vehicles for another company

(svn r6227) -Codechange: added window type flags to use with PlayerVehWndProc
this makes the list type detection much easier and allowed an if cascade to be turned into a switch case
this also makes it easier to add more list types

(svn r6215) -Codechange: [vehicle list windows] unified Player(vehicle)WndProc into PlayerVehWndProc
Those 4 unified functions were really much alike, so there was no reason to have so much dublicated code

(svn r6165) -Feature: control click Goto Depot will now make the vehicle service
at the depot and leave right away.
To tell the difference the status of stopping vehicles will be in red,
while servicing vehicles will be green.
-Codechange: remove some dead code in CmdSendAircraftToHangar() since it is
conflicting with new functionality. Now p2 means the same for all types

(svn r6161) -Feature: List of vehicles with the same shared orders
the list is available in the orders window and looks like the list buttons from the station windows (small vehicle)
The button is disabled if the vehicle do not have any shared orders or it got shared orders, but an empty order list
based on a patch by nycom, thought it ended up getting heavily modified
Thanks to TrueLight for proofreading and suggestions

(svn r6142) -Codechange: added WaypointID (sorry DV, couldn't splits it anymore)
-Codechange: introduced DestinationID, which is in fact an union of several types
Used in Order struct, so no longer StationID is abused for all targets.
Hangars are a big exception, as they use a station-id with GOTO_DEPOT (go figure)

(svn r6046) CodeChange : Rename WWT_5 Widget type to WWT_LABEL : a centered label
CodeChange : Move almost all fixed strings from ON_PAINT event to Widget array using WWT_LABEL.
Feature : All "Select Refit Cargo" are now centered, instead of been left aligned

(svn r5944) -Merge TGP (r5578, r5579, r5724, r5726): -Feature: filter for textboxes to only
allow certain patterns (like numbers only)

(svn r5926) -Codechange: make _cur_year contain the full year, instead of the offset since 1920
-Codechange: store all year related variables that are _not_ stored in a savegame/transported over the network in the same format as _cur_year

(svn r5918) -Cleanup: rename ConvertDayToYMD/ConvertYMDToDay as they really convert a Date to/from a YearMonthDay.
-Cleanup: swap ConvertDateToYMD's parameters to make the order consistent with the name of the function.

(svn r5916) -Cleanup: use MIN_YEAR/MAX_YEAR for the year boundaries and BASE_YEAR when comparing _cur_year with a 'full' year.
-Cleanup: replace some magic '1920' values with BASE_YEAR.

(svn r5887) -Cleanup: move date related functions, defines and variables to date.[ch]
-Cleanup: fix whitespace related coding style issues in date.[ch]
-Cleanup: make original comments doxygen compatible and remove/change outdated comments

(svn r5853) -Fix: [elrails] FS#178 Electric Trains can leave Conventional Depot
now the user will get an error if he tries to start the train and the status bar will say "no power" instead of "stopped"
Electric trains already driving in and out of non-electrified depots will still do so, but you can't start new ones

(svn r5404) Fix (r5391) : Yet another typo. Nothing specatular :)
Spotted by gigajum

(svn r5318) - Allow room for a single pixel overflow on the first engine when drawing a train's image.
- Draw the depot highlight box after drawing all engines on a line, so that the box isn't hidden.

(svn r5225) Some windows periodically check if their parent exists - if not they close themselves
This is unnecessary, because their parents already close them when they get closed
Therefore remove the code for the periodic checks

(svn r4868) - Codechange: in the train detail window, don't call DrawTrainImage() for each row, as we already loop to find the vehicles to
draw. Fixes a potential issue of extraneous wagons being drawn, if they are very short.