Implement OSC 7 for setting the CWD (#20019)

This adds support for OSC 7 which is the same as OSC 9;9 but using
file URIs. As per the previous discussion in #8214, the problem is
that WSL shells emit URIs that can't work because the hostname in
the URI translates to an UNC path with an non-existing hostname.
In my opinion this doesn't deter the fact though that OSC 7 works
just fine for a native Windows application.

In the future we should consider trying to detect WSL file URIs
and translating it to the `--cd` argument for `wsl.exe`.

All of the heavy lifting for parsing the URI is done by 
`PathCreateFromUrlW`. It just had to be plugged into the OSC 9;9 code.

Closes #3158

## Validation Steps Performed
* Launch fish-shell in WSL
* Duplicate tab works ✅
* (And because it doesn't work without using
  `IsValidDirectory` I know that OSC 7 works ✅)

Author: lhecker

src/cascadia/TerminalApp/AppActionHandlers.cpp

@@ -1475,7 +1475,7 @@ namespace winrt::TerminalApp::implementation
                                       WI_IsAnyFlagSet(source, SuggestionsSource::CommandHistory | SuggestionsSource::QuickFixes);
         if (const auto& control{ _GetActiveControl() })
         {
-            currentWorkingDirectory = control.CurrentWorkingDirectory();
+            currentWorkingDirectory = control.WorkingDirectory();
 
             if (shouldGetContext)
             {

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -1600,8 +1600,7 @@ namespace winrt::TerminalApp::implementation
 
             // Replace the Starting directory with the CWD, if given
             const auto workingDirectory = control.WorkingDirectory();
-            const auto validWorkingDirectory = !workingDirectory.empty();
-            if (validWorkingDirectory)
+            if (Utils::IsValidDirectory(workingDirectory.c_str()))
             {
                 controlSettings.DefaultSettings()->StartingDirectory(workingDirectory);
             }
@@ -3555,8 +3554,7 @@ namespace winrt::TerminalApp::implementation
                 profile = GetClosestProfileForDuplicationOfProfile(profile);
                 controlSettings = Settings::TerminalSettings::CreateWithProfile(_settings, profile);
                 const auto workingDirectory = tabImpl->GetActiveTerminalControl().WorkingDirectory();
-                const auto validWorkingDirectory = !workingDirectory.empty();
-                if (validWorkingDirectory)
+                if (Utils::IsValidDirectory(workingDirectory.c_str()))
                 {
                     controlSettings.DefaultSettings()->StartingDirectory(workingDirectory);
                 }

src/cascadia/TerminalApp/TerminalPaneContent.cpp

@@ -102,7 +102,7 @@ namespace winrt::TerminalApp::implementation
 
         args.Profile(::Microsoft::Console::Utils::GuidToString(_profile.Guid()));
         // If we know the user's working directory use it instead of the profile.
-        if (const auto dir = _control.WorkingDirectory(); !dir.empty())
+        if (const auto dir = _control.WorkingDirectory(); ::Microsoft::Console::Utils::IsValidDirectory(dir.c_str()))
         {
             args.StartingDirectory(dir);
         }

src/cascadia/TerminalControl/ControlCore.cpp

@@ -2420,11 +2420,6 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         return *context;
     }
 
-    winrt::hstring ControlCore::CurrentWorkingDirectory() const
-    {
-        return winrt::hstring{ _terminal->GetWorkingDirectory() };
-    }
-
     bool ControlCore::QuickFixesAvailable() const noexcept
     {
         return _cachedQuickFixes && _cachedQuickFixes.Size() > 0;

src/cascadia/TerminalControl/ControlCore.h

@@ -191,8 +191,6 @@ namespace winrt::Microsoft::Terminal::Control::implementation
 
         void ContextMenuSelectCommand();
         void ContextMenuSelectOutput();
-
-        winrt::hstring CurrentWorkingDirectory() const;
 #pragma endregion
 
 #pragma region ITerminalInput

src/cascadia/TerminalControl/ICoreState.idl

@@ -60,7 +60,5 @@ namespace Microsoft.Terminal.Control
         void SelectOutput(Boolean goUp);
         IVector<ScrollMark> ScrollMarks { get; };
 
-        String CurrentWorkingDirectory { get; };
-
     };
 }

src/cascadia/TerminalControl/TermControl.cpp

@@ -3719,10 +3719,6 @@ namespace winrt::Microsoft::Terminal::Control::implementation
     {
         return _core.CommandHistory();
     }
-    winrt::hstring TermControl::CurrentWorkingDirectory() const
-    {
-        return _core.CurrentWorkingDirectory();
-    }
 
     void TermControl::UpdateWinGetSuggestions(Windows::Foundation::Collections::IVector<hstring> suggestions)
     {

src/cascadia/TerminalControl/TermControl.h

@@ -117,8 +117,6 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         void ScrollToMark(const Control::ScrollToMarkDirection& direction);
         void SelectCommand(const bool goUp);
         void SelectOutput(const bool goUp);
-
-        winrt::hstring CurrentWorkingDirectory() const;
 #pragma endregion
 
         void ScrollViewport(int viewTop);

src/terminal/adapter/ITermDispatch.hpp

@@ -82,6 +82,7 @@ class Microsoft::Console::VirtualTerminal::ITermDispatch
     virtual void BackIndex() = 0; // DECBI
     virtual void ForwardIndex() = 0; // DECFI
     virtual void SetWindowTitle(std::wstring_view title) = 0; // DECSWT, OscWindowTitle
+    virtual void SetCurrentWorkingDirectory(const std::wstring_view uri) = 0; // OSC 7
     virtual void HorizontalTabSet() = 0; // HTS
     virtual void ForwardTab(const VTInt numTabs) = 0; // CHT, HT
     virtual void BackwardsTab(const VTInt numTabs) = 0; // CBT
@@ -156,13 +157,9 @@ class Microsoft::Console::VirtualTerminal::ITermDispatch
     virtual void EndHyperlink() = 0;
 
     virtual void DoConEmuAction(const std::wstring_view string) = 0;
-
     virtual void DoITerm2Action(const std::wstring_view string) = 0;
-
     virtual void DoFinalTermAction(const std::wstring_view string) = 0;
-
     virtual void DoVsCodeAction(const std::wstring_view string) = 0;
-
     virtual void DoWTAction(const std::wstring_view string) = 0;
 
     virtual StringHandler DefineSixelImage(const VTInt macroParameter,

src/terminal/adapter/adaptDispatch.cpp

@@ -2615,6 +2615,27 @@ void AdaptDispatch::SetWindowTitle(std::wstring_view title)
     _api.SetWindowTitle(title);
 }
 
+// OSC 7 - Set Current Working Directory
+// While ConEmu's OSC 9;9 works well for native Windows paths,
+// OSC 7 uses file URIs, which may not always work.
+void AdaptDispatch::SetCurrentWorkingDirectory(std::wstring_view uri)
+{
+    // Ensure that the URI has a null terminator.
+    std::wstring path{ uri };
+
+    // PathCreateFromUrlW supports writing to the input pointer,
+    // and the resulting path can never be longer than the URI.
+    const auto ptr = path.data();
+    auto len = gsl::narrow<DWORD>(path.size());
+    THROW_IF_FAILED(PathCreateFromUrlW(ptr, ptr, &len, 0));
+    path.resize(len);
+
+    if (til::is_legal_path(path))
+    {
+        _api.SetWorkingDirectory(path);
+    }
+}
+
 //Routine Description:
 // HTS - sets a VT tab stop in the cursor's current column.
 //Arguments: