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Optimize GlyphTypeface: Avoid create the cmap Dictionary when get Count only

5

## Description As the code shows: https://github.com/dotnet/wpf/blob/f7ebd69146f3ec9b771e92c13250efa99a65a26c/src/Microsoft.DotNet.Wpf/src/PresentationCore/MS/internal/FontCache/FontFaceLayoutInfo.cs#L585-L609 We can know that the cost of creating CMap is expensive. When we get the `Count` only, we do not need to create...

## Description The RegisterHwndForInput only be called by `HwndStylusInputProvider..ctor`. And the `HwndStylusInputProvider..ctor` will pass the `HwndSource source` to RegisterHwndForInput method. So that it unnecessary to use the PresentationSource in RegisterHwndForInput....

WPF will break when an exception be throw in the StylusPlugIn

16

We can write a class that inherits the StylusPlugIn. And this class can get the touch event fast in stylus input thread in the overwrite method, such as `OnStylusDown` and...

WPF topmost window Cannot touch in tablet

1

* .NET Core Version: (e.g. 3.0 Preview1, or daily build number, use `dotnet --info`) 3.0 * Windows version: (`winver`) All version * Does the bug reproduce also in WPF for...

* .NET Core Version: 3.0 Preview1 * Windows version: (`Windows 10 all versions / 7 SP1`) * Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes **Problem...

Throw IndexOutOfRangeException in WispLogic.CoalesceAndQueueStylusEvent

8

* .NET Core Version: 3.0.100-preview5-011568 * Windows version: 1903 18362.145 * Does the bug reproduce also in WPF for .NET Framework 4.8?: Find in 4.7 **Problem description:** The application crash....

We need the user use multitouch in InkCanvas and the DynamicRender do not support multitouch.

WPF can not receive the touch message when set WS_EX_TRANSPARENT to window

1

* .NET Core Version: 3.1.300 * Windows version: 10.0.18362 * Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes **Problem description:** WPF can not receive the touch...

The main thread of the WPF application that starts automatically at boot will forever wait for the touch thread to execute

1

* .NET Core Version:3.1.300 * Windows version: 10.0.18362 * Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes **Problem description:** The WPF application does not show the...

### Description The `UnsafeNativeMethods.GetPenEventMultiple` in `PenThreadWorker.ThreadProc` will throw System.DivideByZeroException. This is not a good report and I lack the steps to reproduce it. This exception info from my application telemetry....