Upcoming

Breaking changes

(>=v8.0.0) Setting model data for a qx.ui.table.Table when the table is still editing will now raise an error as this could have lead to an invalid edit. To prevent any errors, ensure that the table edits are completed or cancelled before refreshing table model data.

The qx.library config setting is no longer used by the compiler. If you want to override the path to the framework source, add the path to compile.json's libraries array.
qx.ui.form.Slider now works correctly in vertical orientation. The maximum value is at the top of the slider and the minimal value at the bottom. Before that, the 2 values were reversed
all flash supporting classes are removed - flash is dead since January 2020.
qx.ui.command.Group fixed a bug where new qx.ui.command.Command added was not set the active status of the group, thus staying active even if the group was inactive.
qx.theme.tangible fixed typo focussed -> focused. If inheriting from the theme make sure to update colors to primary-focused or error-focused.

New Javascript-based compiler: Previous versions of Qooxdoo used a Python v2 based tool called the Generator (./generate.py); the generator is still supported in Qooxdoo v6 but is deprecated and will be removed completely for Qooxdoo v7. Legacy documentation can be found here: https://archive.qooxdoo.org/5.0.2/ . To migrate, see https://qooxdoo.org/documentation/#/development/compiler/migration .

qx.ui.core.scroll.AbstractScrollArea: The width and height are now fixed. To reenable dynamic growing, the width or height can be set to null.
qx.bom.Cookie: Previous versions of qooxoo use escape() and unescape() functions. Since those functions are deprecated, then now qooxdoo use encodeURIComponent() and decodeURIComponent() functions. This may break some cookies. There are no issues with special characters like ~!@#$%^&*(){}[]=:/,;?+\'"\\ but some unicode characters like äëíöü (etc) are encoded different by escape() and encodeURIComponent(), so you must take care of this change if you use unicode characters. Also, by default cookies are created with SameSite=Strict, whereas previously they were created without SameSite unless you specified it explicitly; recent browsers block cookies without SameSite, so in most cases this will save you from having to make changes to your code.
qx.bom.client.Css: Removed obsolete IE-Feature check methods getFilterGradient and getFilterTextShadow. If used in production code, consider them as being a false value.
qx.core.Environment: Removed obsolete IE-Feature keys "css.gradient.filter" and "css.textShadow.filter". If used in production code, consider them as being a false value.
qx.ui.splitpane.Splitter: New Property knobVisible toggles

visibility of the splitter's button. Property visible toggles visibility of the whole splitte widget (no change from v5.0.x).

qx.ui.table.cellrenderer.AbstractImage: change vertical alignment from top to middle.
qx.ui.basic.Image adds a new scaling feature to preserve the size ratio of the image (ie scaling without stretching); if you enable scaling, the ratio is now preserved by default - if you actually want to stretch an image, you will have to set the image's forceRatio setting to disabled
qxWeb is now build through the compiler with qx deploy. The old bootstrap code

    q.ready(function() {
    });

will not work any longer. The q.ready function is not called. You need to change your bootstrap code to listen to the qx.$$loader ready event:

    qx.$$loader.on("ready", function() {
    });