Add a setting to disable pane snapping

doc/cascadia/SettingsSchema.md

@@ -14,6 +14,7 @@ Properties listed below affect the entire window, regardless of the profile sett
 | `requestedTheme` | _Required_ | String | `system` | Sets the theme of the application. Possible values: `"light"`, `"dark"`, `"system"` |
 | `showTerminalTitleInTitlebar` | _Required_ | Boolean | `true` | When set to `true`, titlebar displays the title of the selected tab. When set to `false`, titlebar displays "Windows Terminal". |
 | `showTabsInTitlebar` | Optional | Boolean | `true` | When set to `true`, the tabs are moved into the titlebar and the titlebar disappears. When set to `false`, the titlebar sits above the tabs. |
+| `snapToGridOnResize` | Optional | Boolean | `false` | When set to `true`, the window will snap to the nearest character boundary on resize. When `false`, the window will resize "smoothly" |
 | `wordDelimiters` | Optional | String | <code>&nbsp;&#x2f;&#x5c;&#x28;&#x29;&#x22;&#x27;&#x2d;&#x3a;&#x2c;&#x2e;&#x3b;&#x3c;&#x3e;&#x7e;&#x21;&#x40;&#x23;&#x24;&#x25;&#x5e;&#x26;&#x2a;&#x7c;&#x2b;&#x3d;&#x5b;&#x5d;&#x7b;&#x7d;&#x7e;&#x3f;│</code><br>_(`│` is `U+2502 BOX DRAWINGS LIGHT VERTICAL`)_ | Determines the delimiters used in a double click selection. |
 
 ## Profiles

doc/cascadia/profiles.schema.json

@@ -318,6 +318,11 @@
           "description": "When set to true, titlebar displays the title of the selected tab. When set to false, titlebar displays 'Windows Terminal'.",
           "type": "boolean"
         },
+        "snapToGridOnResize": {
+          "default": false,
+          "description": "When set to `true`, the window will snap to the nearest character boundary on resize. When `false`, the window will resize 'smoothly'",
+          "type": "boolean"
+        },
         "wordDelimiters": {
           "default": " ./\\()\"'-:,.;<>~!@#$%^&*|+=[]{}~?│",
           "description": "Determines the delimiters used in a double click selection.",

src/cascadia/TerminalApp/GlobalAppSettings.cpp

@@ -29,6 +29,7 @@ static constexpr std::string_view ShowTabsInTitlebarKey{ "showTabsInTitlebar" };
 static constexpr std::string_view WordDelimitersKey{ "wordDelimiters" };
 static constexpr std::string_view CopyOnSelectKey{ "copyOnSelect" };
 static constexpr std::string_view LaunchModeKey{ "launchMode" };
+static constexpr std::string_view SnapToGridOnResizeKey{ "snapToGridOnResize" };
 static constexpr std::wstring_view DefaultLaunchModeValue{ L"default" };
 static constexpr std::wstring_view MaximizedLaunchModeValue{ L"maximized" };
 static constexpr std::wstring_view LightThemeValue{ L"light" };
@@ -206,6 +207,7 @@ Json::Value GlobalAppSettings::ToJson() const
     jsonObject[JsonKey(LaunchModeKey)] = winrt::to_string(_SerializeLaunchMode(_launchMode));
     jsonObject[JsonKey(RequestedThemeKey)] = winrt::to_string(_SerializeTheme(_requestedTheme));
     jsonObject[JsonKey(KeybindingsKey)] = _keybindings->ToJson();
+    jsonObject[JsonKey(SnapToGridOnResizeKey)] = _SnapToGridOnResize;
 
     return jsonObject;
 }
@@ -293,6 +295,11 @@ void GlobalAppSettings::LayerJson(const Json::Value& json)
     {
         _keybindings->LayerJson(keybindings);
     }
+
+    if (auto snapToGridOnResize{ json[JsonKey(SnapToGridOnResizeKey)] })
+    {
+        _SnapToGridOnResize = snapToGridOnResize.asBool();
+    }
 }
 
 // Method Description:

src/cascadia/TerminalApp/GlobalAppSettings.h

@@ -76,6 +76,8 @@ class TerminalApp::GlobalAppSettings final
 
     void ApplyToSettings(winrt::Microsoft::Terminal::Settings::TerminalSettings& settings) const noexcept;
 
+    GETSET_PROPERTY(bool, SnapToGridOnResize, true);
+
 private:
     GUID _defaultProfile;
     winrt::com_ptr<winrt::TerminalApp::implementation::AppKeyBindings> _keybindings;

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -1122,11 +1122,22 @@ namespace winrt::TerminalApp::implementation
     }
 
     // Method Description:
+    // - Calculates the appropriate size to snap to in the gived direction, for
+    //   the given dimension. If the global setting `snapToGridOnResize` is set
+    //   to `false`, this will just immediately return the provided dimension,
+    //   effectively disabling snapping.
     // - See Pane::CalcSnappedDimension
     float TerminalPage::CalcSnappedDimension(const bool widthOrHeight, const float dimension) const
     {
-        const auto focusedTabIndex = _GetFocusedTabIndex();
-        return _tabs[focusedTabIndex]->CalcSnappedDimension(widthOrHeight, dimension);
+        if (_settings->GlobalSettings().SnapToGridOnResize())
+        {
+            const auto focusedTabIndex = _GetFocusedTabIndex();
+            return _tabs[focusedTabIndex]->CalcSnappedDimension(widthOrHeight, dimension);
+        }
+        else
+        {
+            return dimension;
+        }
     }
 
     // Method Description:

src/cascadia/TerminalApp/defaults.json

@@ -7,6 +7,7 @@
     "requestedTheme": "system",
     "showTabsInTitlebar": true,
     "showTerminalTitleInTitlebar": true,
+    "snapToGridOnResize": false,
     "wordDelimiters": " /\\()\"'-.,:;<>~!@#$%^&*|+=[]{}~?\u2502",
 
     "profiles":