Highlighted code blocks inside the app (#1153)

app/MindWork AI Studio/Tools/CodeHighlighting/CodeMarkerPlace.cs

@@ -0,0 +1,32 @@
+namespace AIStudio.Tools.CodeHighlighting;
+
+/// <summary>
+/// Where a marker of a language has to appear in a code block, see CodeLanguageMarker.
+/// </summary>
+public enum CodeMarkerPlace
+{
+    /// <summary>
+    /// Anywhere in the code, also across a line break.
+    /// </summary>
+    ANYWHERE,
+
+    /// <summary>
+    /// At the start of a line, after its indentation.
+    /// </summary>
+    LINE_START,
+
+    /// <summary>
+    /// At the end of a line, before any space behind it.
+    /// </summary>
+    LINE_END,
+
+    /// <summary>
+    /// As a line of its own, apart from its indentation, such as the fi of a shell script.
+    /// </summary>
+    WHOLE_LINE,
+
+    /// <summary>
+    /// At the start of the first line which is not empty, such as a shebang.
+    /// </summary>
+    FIRST_LINE,
+}