This doesn't seem to work either.

  I tried adding the pane seperators to the Pane::_GetMinWidth calculation. That
  works for prevent the crash, but the resizing is wonky now. If you add a
  Vertical split, then a second, then resize the middle pane really small,
  you'll see that the _last_ resize doesn't work properly. The text seems to
  overhand into the border.

  Additionally, there's really weird behavior resizing panes to be small. They
  don't always seem to be resizable to the smallest size.

src/cascadia/TerminalApp/Pane.cpp

@@ -133,14 +133,16 @@ bool Pane::_Resize(const Direction& direction)
     // actualDimension is the size in DIPs of this pane in the direction we're
     // resizing.
     auto actualDimension = changeWidth ? actualSize.Width : actualSize.Height;
-    actualDimension -= CombinedPaneBorderSize;
+    // actualDimension -= CombinedPaneBorderSize;
 
     const auto firstMinSize = _firstChild->_GetMinSize();
     const auto secondMinSize = _secondChild->_GetMinSize();
 
     // These are the minimum amount of space we need for each of our children
-    const auto firstMinDimension = (changeWidth ? firstMinSize.Width : firstMinSize.Height) + PaneBorderSize;
-    const auto secondMinDimension = (changeWidth ? secondMinSize.Width : secondMinSize.Height) + PaneBorderSize;
+    // const auto firstMinDimension = (changeWidth ? firstMinSize.Width : firstMinSize.Height) + PaneBorderSize;
+    // const auto secondMinDimension = (changeWidth ? secondMinSize.Width : secondMinSize.Height) + PaneBorderSize;
+    const auto firstMinDimension = changeWidth ? firstMinSize.Width : firstMinSize.Height;
+    const auto secondMinDimension = changeWidth ? secondMinSize.Width : secondMinSize.Height;
 
     const auto firstMinPercent = firstMinDimension / actualDimension;
     const auto secondMinPercent = secondMinDimension / actualDimension;
@@ -1029,13 +1031,31 @@ Size Pane::_GetMinSize() const
 {
     if (_IsLeaf())
     {
-        return _control.MinimumSize();
+        // return _control.MinimumSize();
+        ///////////////
+        auto controlSize = _control.MinimumSize();
+        auto newWidth = controlSize.Width;
+        auto newHeight = controlSize.Height;
+
+        newWidth += WI_IsFlagSet(_borders, Borders::Left) ? PaneBorderSize : 0;
+        newWidth += WI_IsFlagSet(_borders, Borders::Right) ? PaneBorderSize : 0;
+
+        newHeight += WI_IsFlagSet(_borders, Borders::Top) ? PaneBorderSize : 0;
+        newHeight += WI_IsFlagSet(_borders, Borders::Bottom) ? PaneBorderSize : 0;
+        return { newWidth, newHeight };
     }
 
     const auto firstSize = _firstChild->_GetMinSize();
     const auto secondSize = _secondChild->_GetMinSize();
-    const auto newWidth = firstSize.Width + secondSize.Width + (_splitState == SplitState::Vertical ? CombinedPaneBorderSize : 0);
-    const auto newHeight = firstSize.Height + secondSize.Height + (_splitState == SplitState::Horizontal ? CombinedPaneBorderSize : 0);
+    // const auto newWidth = firstSize.Width + secondSize.Width + (_splitState == SplitState::Vertical ? CombinedPaneBorderSize : 0);
+    // const auto newHeight = firstSize.Height + secondSize.Height + (_splitState == SplitState::Horizontal ? CombinedPaneBorderSize : 0);
+    auto newWidth = firstSize.Width + secondSize.Width;
+    // newWidth += WI_IsFlagSet(_borders, Borders::Left) ? PaneBorderSize : 0;
+    // newWidth += WI_IsFlagSet(_borders, Borders::Right) ? PaneBorderSize : 0;
+    auto newHeight = firstSize.Height + secondSize.Height;
+    // newHeight += WI_IsFlagSet(_borders, Borders::Top) ? PaneBorderSize : 0;
+    // newHeight += WI_IsFlagSet(_borders, Borders::Bottom) ? PaneBorderSize : 0;
+
     return { newWidth, newHeight };
 }