dotnet/releases/net471/KnownIssues/479874-WPF Touch Stops Work...

# WPF Touch Stops Working After Rapid/Prolonged Use Of Popups

## Symptoms
On a touch or stylus-enabled machine, WPF applications may see a loss of touch or stylus after rapid or prolonged use of popups (e.g. ComboBoxes, DropDown Menus).

## Cause
A change to disposal of HwndSource in .NET 4.7 caused Popups to not correctly cleanup touch resources.  This eventually can lead to loss of touch/stylus interaction.

## Resolution
This issue is fixed for all supported OS platforms prior to Windows 10 Fall Creators Update. The fix for Windows 10 Fall Creators Update is expected in a future servicing update.
Update 479874-WPF Touch Stops Working After Prolonged Use of Popups.md 2017-10-19 04:52:18 +08:00			`# WPF Touch Stops Working After Rapid/Prolonged Use Of Popups`
Known issues for WPF Touch bugs that did not make 4.7.1 RS3 (#494) * Known issues for WPF Touch bugs that did not make 4.7.1 RS3 * Known issues for WPF Touch bugs that did not make 4.7.1 RS3 * Adding InvalidCastException bug for 4.7.1 known issues * Addressing Feedback 2017-10-05 06:56:47 +08:00
Update 479874-WPF Touch Stops Working After Prolonged Use of Popups.md 2017-10-19 04:52:18 +08:00			`## Symptoms`
Known issues for WPF Touch bugs that did not make 4.7.1 RS3 (#494) * Known issues for WPF Touch bugs that did not make 4.7.1 RS3 * Known issues for WPF Touch bugs that did not make 4.7.1 RS3 * Adding InvalidCastException bug for 4.7.1 known issues * Addressing Feedback 2017-10-05 06:56:47 +08:00			`On a touch or stylus-enabled machine, WPF applications may see a loss of touch or stylus after rapid or prolonged use of popups (e.g. ComboBoxes, DropDown Menus).`

Update 479874-WPF Touch Stops Working After Prolonged Use of Popups.md 2017-10-19 04:52:18 +08:00			`## Cause`
Known issues for WPF Touch bugs that did not make 4.7.1 RS3 (#494) * Known issues for WPF Touch bugs that did not make 4.7.1 RS3 * Known issues for WPF Touch bugs that did not make 4.7.1 RS3 * Adding InvalidCastException bug for 4.7.1 known issues * Addressing Feedback 2017-10-05 06:56:47 +08:00			`A change to disposal of HwndSource in .NET 4.7 caused Popups to not correctly cleanup touch resources. This eventually can lead to loss of touch/stylus interaction.`

Update 479874-WPF Touch Stops Working After Prolonged Use of Popups.md 2017-10-19 04:52:18 +08:00			`## Resolution`
			`This issue is fixed for all supported OS platforms prior to Windows 10 Fall Creators Update. The fix for Windows 10 Fall Creators Update is expected in a future servicing update.`