Do not take empty lines into account when computing `raw` block dedent (#1676)

crates/typst/src/syntax/ast.rs

@@ -565,6 +565,9 @@ impl Raw {
             let dedent = lines
                 .iter()
                 .skip(1)
+                .filter(|line| !line.chars().all(char::is_whitespace))
+                // The line with the closing ``` is always taken into account
+                .chain(lines.last())
                 .map(|line| line.chars().take_while(|c| c.is_whitespace()).count())
                 .min()
                 .unwrap_or(0);

tests/typ/text/raw.typ

@@ -4,6 +4,10 @@
 // No extra space.
 `A``B`
 
+---
+// Empty raw block.
+Empty raw block:``.
+
 ---
 // Typst syntax inside.
 ```typ #let x = 1``` \
@@ -48,6 +52,22 @@ The keyword ```rust let```.
        C
      ```
 
+---
+// Do not take empty lines into account when computing dedent.
+```
+        A
+
+        B
+```
+
+---
+// Take last line into account when computing dedent.
+```
+        A
+
+        B
+    ```
+
 ---
 // Text show rule
 #show raw: set text(font: "Roboto")