(svn r7356) -Codechange: replace 'for (i = 0, wi = w->widget; wi->type != WWT_LAST; i++, wi++)' type for loops with 'for (i = 0; i < w->window_count; i++) { wi = &w->widget[i];'-type for loops for better readability.
-Codechange: use IsWindowWidget(Disabled|Hidden) in favor of IsWidget(Disabled|Hidden).

(svn r7310) -Codechange: Change scrolling dropdown box to use 1 scroll unit = 1 line
of text, instead of 1 row of pixels. This fixes behaviour of scrolling
with the scrollbar buttons and the mouse wheel.

(svn r7206) -Codechange: Remove (some of) the magic needed for windows that could be invalid after
a call to DeleteWindow() somewhere else. Also do some cleanup with AllowWindowDescFront()

(svn r6927) -Codechange: No need to explicitly cast a boolean to a boolean and move draw_default
goto outside of switch statement.

(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 r6661) Feature: Windows are not restricted to 32 widget items anymore.
The functions required to do so are to be found in window.h.
Rather then use the old deprecated disabled_state, hidden_state and click_state uint32 variables,
we now need to use accessors like SetWindowWidgetDisabledState, SetWindowWidgetHiddenState or SetWindowWidgetLoweredState.
This is the final commit for the merge of XTDwidget branch.

(svn r6631) -Codechange: Use accessors for click_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 r6222) Remove struct ColorList, because the names of its attributes are plain confusing
All the struct holds is a simple colour gradient, so using a simple array with 8 entries is more clear
Also add the names of colour the gradients as enum

(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 r3247) - Fix: "[ 1335580 ] sticky windows not sticky anymore"
Determine clicked status of sticky icon from window flags rather than the widget click state. This keeps the status in one place where it can't get out of sync.

(svn r3181) -Bracing
-Indentation
-Whitespace
-DeMorgan's Law
-Test with NULL or 0 for non-booleans
-'\0' instead of 0 for chars
-Remove redundantly redundant comments (like DoFoo(); // Do foo)
-Join multiple short lines with a single statement
-Split single lines with multiple statements
-Avoid assignments in if

(svn r3077) static, const, bracing, indentation, 0 -> '\0'/NULL, typos in comments, excess empty lines, minor other changes
nothing spectacular, just some stuff, which piled up

(svn r2974) -Fix: Drag and drop selection on drop down boxes didn't select correct item when some items were hidden.
-Separate disabled and hidden masks in drop downs to support both hidden and disabled items.

(svn r2962) - const correctness for all Get* functions and most Draw* functions that don't change their pointer parameters
- change a lot of byte player types to PlayerID
- beautify header files, same "#endif /* filename */" ending

(svn r2573) Codechange: Removed WDF_RESTORE_DPARAM, it's not needed with the new string system.
Also fixed a bug introduced in r2564, forgot to remove 4 global variables in network_gui.c.

(svn r2161) - Fix: When resizing a window, the button is also visibly depressed
- CodeChange: Use images as arrows in the scenario-date scroller, looks better
- Feature: Clicked buttons with images/text now visibly depress their contents when pressed (eg it really seems like the button is moving)
- Fix: Fix sprite offsets of the arrow sprites in openttd.grf

(svn r1679) Fix: dropdown menus now returns the index of the string that was clicked even if a previous item is hidden
This bug was not triggered by the current code, but it's easier to code new features if you do not have to think about such limitations
like you can't hide an item in the middle of the list ;)

(svn r1368) -Fix: Disabled dropdown menu options are gray again (instead of blue)
(redid revision 1357)

(svn r1348) -Feature: resizable windows. Read the comment in window.h to find out
how the system works. All useful windows are already made resizable. Enjoy :)
-Fix: fixed some GUI-glitches and flaws along the way

(svn r1341) -Fix: fix WWT_FRAME drawing when there is no text there (STR_NULL)
-Copyright notice is now 2002-2005 for all languages

(svn r1323) Adding autoreplace feature
This feature works much like autorenew, but it will get you a new engine type instead of a new one of the same type. Once
ordered, it will automatically replace the engines while they visits a depot. The GUI for setting this up have been added on the
vehicle overview windows
Note: autorenew is now autoreplace, but to the same engine type
Nice new features, that was added to make this possible
- windows can now have two independant vertical scrollbars
- CMD_SHOW_NO_ERROR have been added as a flag for DoCommandP. It will make it do the action instead of showing the red box with
estimated costs even if shift is pressed
- fixed problem where enginetypes where not initialized when loading a game. It's now done in InitializeGame()

(svn r1121) -Feature: Added sticky windows feature. A small pin allows the user to set the window as undeletable and can only be closed by hand. As an example the viewport window has been stickied (thanks to Neko-San)
-To use the feature add WDF_STICKY_BUTTON to the widget description and update all widget-ID's since sticky button will be widget 2.

(svn r815) Include strings.h only in the files which need it.
This should reduce the compile time after altering english.txt by about 1/3, because "only" 62 instead of 90 .c files must be recompiled.

(svn r177) -Fix: padded out Widget code to solve warnings on C99 compiler (Tron)
-Fix: added WIDGETS_END macro for WWT_LAST which does this for all last widget-types

(svn r165) -Feature: Option to sort vehicles in vehicle-list window by different criteria. Total independent sort for all types and players. Periodic resort of list every 10 TTD days. Thank you for your graphical inspiration follow and buxo (since none of you provided any code).
-Fix: Sorter icon pointing down 'v' sorts in every window lowest value first, '^' highest value first
-CodeChange: move Dropdownlist from settings_gui.c to widget.c. More in place there.