# 4.15.0



* Improvements #12495: Enable charting library to use external javascript libraries such as Charts.js or D3js
* Bug #14703: WLink to WResource not taking changed session id into account
* Improvements #14709: Use Beacon API to send unload signal
* Improvements #6332: Documentation for Wt::Signals and Wt::Signals::connection missing in Wt 4
* Bug #14772: Wt.js: getInlineStyleSheet() adopts the first <style> in the document, not Wt's own
* Improvements #14729: Handle focus change when a popup is deleted on the javascript side
* Improvements #14728: Reduce communication due to focus handling
* Improvements #14727: Add alias to Side enum for RTL
* Improvements #11049: Mitigate issues that may arise from changing the session id
* Bug #14786: Missing last resize handle for JavaScript WBoxLayout in reverse order
* Improvements #14171: Do not parse WMessageResourceBundle each time on WApplication launch
* Feature #14582: Add a way to reveal text in WPasswordEdit
* Bug #14619: Resizable Layout not working correctly when created as DeferredWidget or with ContentLoading::Lazy
* Feature #14162: Extend WLength with additional (newer) values
* Bug #14606: WMenuItem::setContent() changes the selected index of the WMenu
* Bug #14761: Fix RTL x coordinate inversion.
* Improvements #13294: Add alternative httpsPort()
* Feature #8759: Add a WDateTimeEdit
* Bug #14594: Later WTableView::setColumnAlignment has no effect
* Feature #7417: HiDPI canvas for WPaintedWidget
* Improvements #14681: Add simple example for Dbo::Form
* Bug #14701: Signals of WTextEdit
* Feature #7598: Consider providing independent weakSessionIds to identify private WResource URLs
* Improvements #14697: expireSessions() Can Block All Worker Threads When a Session Lock Is Held
* Feature #14539: Allow for explicit caching lifetime control (cache-busting)
* Feature #12496: Temporary directory and temporary file names
* Feature #14163: Add resize handles to Flex layouts
* Bug #13872: WCompositeWidget does not Apply Style classes from Implementation class
* Bug #14726: WTextEdit incorrectly handles size changes in a layout
* Bug #14730: WDialog::setFirstFocus ignores footer and does not focus the WDialog as fallback
* Bug #13956: WPopupMenu not visible if popped up at itemWidget of (a narrow) WTableView with vertical scrollbar
* Bug #14758: BS5: TypeError: can't access property "parentNode", this._element is undefined
* Feature #14775: Add an option to block WApplication::getInstance() from returning the WApplication if the thread does not hold the session lock.