Universal Windows Platform

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  1. BUG: Setting PreferredLaunchWindowingMode before PreferredLaunchViewSize is set results in undefined behavior

    BUG: Setting PreferredLaunchWindowingMode before PreferredLaunchViewSize is set results in undefined behavior

    Repro project:
    https://github.com/riverar/fuzzy-chainsaw

    Documentation:
    https://docs.microsoft.com/en-us/uwp/api/windows.ui.viewmanagement.applicationview#Windows_UI_ViewManagement_ApplicationView_PreferredLaunchViewSize

    Credits:
    David Golden (@GoldenTao), Rafael Rivera (@WithinRafael)

    7 votes
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      0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
    • BUG: PreferredLaunchViewSize behavior differs between launches, is undocumented

      BUG: PreferredLaunchViewSize must be 500x320 or higher at first launch (assuming 100% scale size). Subsequent launches can be user-defined as long as size is >= SetPreferredMinSize.

      Repro project:
      https://github.com/riverar/fuzzy-chainsaw

      Documentation:
      https://docs.microsoft.com/en-us/uwp/api/windows.ui.viewmanagement.applicationview#Windows_UI_ViewManagement_ApplicationView_PreferredLaunchViewSize

      Credits:
      David Golden (@GoldenTao), Rafael Rivera (@WithinRafael)

      5 votes
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        0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
      • ucrtbase bug: _wspawnve is broken

        There is a serious bug in CRT (ucrtbase) which is part of Windows 10.
        The long story (please read it, since it contains all information about this bug): https://youtrack.jetbrains.com/issue/PY-17069#comment=27-1803709

        The short story:
        _wspawnve is broken when launched from Explorer (not cmd) because ``cenvarg.cpp`` expects undocumented environment variable ``=C`` (covered here: https://blogs.msdn.microsoft.com/oldnewthing/20100506-00/?p=14133) and this variable is not provided by Explorer.

        Tool to reproduce.

        ```
        #include<process.h>
        // Works from cmd.exe, but not from Explorer on Win10 :)
        void main() {
        const wchar_t* const args[] = {L"c:\\windows\\system32\\cmd.exe", L"/?", NULL};
        const wchar_t* const envs[] = { L"FOO=BAR", NULL};
        int r;

        _wspawnve(P_WAIT, L"c:\\windows\\system32\\cmd.exe", args,…

        24 votes
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          8 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
        • Clipboard content should persist even if it contains a delayed format

          I've noticed that when you create a DataPackage containing both data provided directly (let's say text, using SetData) and delayed formats like a bitmap (using SetDataProvider), when closing the application the whole clipboard content is cleared.
          I expect that the content set directly (the text) to persist after closing the application.

          13 votes
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            1 comment  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
          • DevCenter shows health data for apps not released to the store

            Recently, the DevCenter team did a regression that internal packages (destined for QA team for example) will still send data to the DevCenter health report view.

            This is a regression. I don't see the benefit and it put noise into data with real customers data.

            1 vote
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              0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
            • CopyFrameToStereoscopicVideoSurfaces not work

              the CopyFrameToStereoscopicVideoSurfaces can only get left eye content when playing Stereoscopic Video.

              project to reproduce the bug:

              https://1drv.ms/u/s!AgQabsfCwh56hhpkvrmRHihShtxA

              or a project does not use win2D

              https://1drv.ms/u/s!AgQabsfCwh56hht2PLGlI1LjOY0o

              the video is red+blue, but CopyFrameToStereoscopicVideoSurfaces can only get red part

              1 vote
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                1 comment  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
              • [Bug] x:Bind event binding fails compiling with differing parameter names

                According to the documentation, it is possible to x:Bind events to a handler.
                According to the docs:
                "For events, the target method must not be overloaded and must also:

                - Match the signature of the event.
                - OR have no parameters.
                - OR have the same number of parameters of types that are assignable from the types of the event parameters."

                When working with parameters, this works as long as the parameters have the default names.

                So for the CalendarView.SelectedDatesChanged event, the following signature works:
                SelectedDatesChanged(CalendarView sender, CalendarViewSelectedDatesChangedEventArgs arg)

                Now if you change the name of one of the parameters,…

                1 vote
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                  0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                • Clipping does not work anymore since Creators Update

                  If you create XAML like this:

                  <Line X1="50" Y1="50" X2="150" Y2="50" Stroke="Black" StrokeThickness="10" Visibility="Visible">
                  <Line.Clip>
                  <RectangleGeometry Rect="50 50 100 10">
                  </RectangleGeometry>
                  </Line.Clip>
                  </Line>

                  it used to work fine and it still does in the designer. But as soon as you run the Code the Line disappears.

                  5 votes
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                    1 comment  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                  • Master-Detail with x:Bind is not working properly: Changes are lost when selecting new item in master

                    Master-Detail with x:Bind is not working properly. When you use x:Bind to bind a TextBox to a property of the SelectedItem of a ListView, this problem exists:
                    1. you change the value in the TextBox
                    2. you select a new item in the listView
                    3. Your changes from 1 are lost, because the selection in the ListView changes before the LostFocus-event of the TextBox was raised. That means the change was never written back to the original item.

                    This bug, more description and the code to reproduce it can be found in this blogpost:
                    https://www.thomasclaudiushuber.com/2016/07/16/uwp-the-master-detail-problem-with-the-events-selectionchanged-lostfocus-and-how-to-fix-it/

                    1 vote
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                      0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                    • Launcher action LaunchUriAsync opens target too slow

                      When using the LaunchUriAsync opens the uri too slow making users think applications do not work and clicking/tapping several times and then get confronted with an app or browser opening several times.

                      1 vote
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                        1 comment  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →

                        i just tested on my work laptop (running Win10 Creators Update) after a fresh restart and edge started instantly both times. Without a repro from you, i can’t reproduce this locally.

                        Any reason why you are using tapped versus clicked also?

                        my uwp basic app is 2 buttons that wire into one of these two events

                        private async void Button_ClickAsync(object sender, RoutedEventArgs e) { await Launcher.LaunchUriAsync(new Uri(“http://www.bing.com”;)); } private async void Button_TappedAsync(object sender, TappedRoutedEventArgs e) { await Launcher.LaunchUriAsync(new Uri(“http://www.microsoft.com”;)); }
                      • Applied font style of the WPF Richtext Editor

                        When the Japanese IME is ON, inserting a character into the WinForm Richtext Editor and the MS Word will apply the font style of the left character.
                        But in the WPF Richtext Editor, inserting a character will apply the font style of the right character.
                        In Japanese input, the font style should be applied to the left character.

                        1 vote
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                          0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                        • Allow more than one team member associated their Visual Studio Project to an app

                          This will greatly improve developing for the windows store app, which requires you to associate your VS project to an app. For large teams, just having one team member being able to do this is a bad design decision.

                          1 vote
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                            1 comment  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                          • [Bug] UWP MenuFlyoutPresenter displayed with wrong background brush when placed in CommandBar.SecondaryCommands in Page.TopAppBar

                            In UWP, when a MenuFlyout control is placed within a CommandBar inside the Page.TopAppBar (or BottomAppBar), in Light theme the MenuFlyoutPresenter has the incorrect background color.

                            To recreate, paste the below XAML into a blank page and run (be sure the app is configured to use Dark theme). The CommandBar in the Page body works as expected. The CommandBar in the Page.TopAppBar has a dark MenuFlyoutPresenter Background brush.

                            A pseudo-fix is demonstrated with the third CommandBar in the BottomAppBar: if the CommandBar.RequestedTheme property is explicity set to Light, the MenuFlyoutPresenter will have a grayish background that isn't ideal but makes…

                            1 vote
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                              0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                            • FutureAccessList bug after OS update

                              As the pervious post has been marked as completed: https://wpdev.uservoice.com/forums/110705-universal-windows-platform/suggestions/13364760-futureaccesslist-token I'm rising the problem again. This is still happening - I've tested it myself now after the update to 10.0.14393.953. My users are also reporting the same problem and some of them say they resign of the app/platform (!) and I must say that I completely understand them.

                              How we, the developers, are supposed to work when such important thing like access to files is not working after the OS update. This affects many of the apps and in result the whole platform.

                              The FutureAccessList has an issue. After a…

                              2 votes
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                                4 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                              • Using x:Bind or Binding in a Setter Value property of a VisualState

                                Using x:Bind or Binding in a Setter Value property of a VisualState will not be executed at the start of the view, you have to change the state of the and then go back before the bindings are used resulting in initial views being broken.

                                For code sample see: http://stackoverflow.com/questions/43880567/uwp-bindings-in-visualstate-setters

                                3 votes
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                                  on the backlog  ·  0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                                • 3 votes
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                                    0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Potential bug in ObservableCollection when adding list of items

                                    We have implemented a FastObservableCollection (see https://github.com/Catel/Catel/blob/8e11fda46dccb487787dc955a79b194c26ac15e0/src/Catel.MVVM/Catel.MVVM.Shared/Collections/FastObservableCollection.cs#L438)

                                    When adding (or removing) a lot of items, we suspend the events and will raise a *single* event for all the items that were changed during the suspension period. This makes the collection much faster to work with when making large changes.

                                    Before recent changes, we were (ab)using the .Reset event type to inform the UI components that the collection has changed. In the current version, we have optimized the collection so it knows *exactly* what has changed in the suspension state. We will only invoke the correct Add / Remove actions…

                                    1 vote
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                                      0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                                    • SerialDevice unstable when compiled using Native

                                      The SerialDevice implementation appears to be very unstable in general, but doubly so when compiling as Native.

                                      The following will reliably throw some flavor of interop exception:

                                      public async Task<byte[]> ReadAsync(uint count, CancellationToken cancellationToken)
                                      {
                                      using (var reader = new DataReader(_serialDevice.InputStream))
                                      {
                                      var read = await reader.LoadAsync(count).AsTask(cancellationToken).ConfigureAwait(false);

                                      var data = new byte[read];
                                      reader.ReadBytes(data);
                                      reader.DetachStream();
                                      return data;
                                      }
                                      }

                                      This will reliably result in a BSOD if zero bytes are returned (not clear why LoadAsync isn't blocking either):

                                      public async Task<byte[]> ReadAsync(uint count, CancellationToken cancellationToken)
                                      {
                                      using (var reader = new DataReader(_serialDevice.InputStream))
                                      {
                                      await reader.LoadAsync(count).AsTask(cancellationToken).ConfigureAwait(false);

                                      var data = new byte[count];
                                      reader.ReadBytes(data); …

                                      1 vote
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                                        0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                                      • 1 vote
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                                          0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                                        • DatePickerFlyout: selected date not updated from source

                                          A DatePickerFlyout whose Date is two-way bound will update target-to-source but not source-to-target.

                                          The following link appears to refer to the same bug. After seven months, the issue still has not been addressed. https://social.msdn.microsoft.com/Forums/windowsapps/en-US/240718c8-a5ee-4528-a748-0d6511401dcf

                                          1 vote
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                                            0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
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