Fix forc-fmt empty if-body + else collapsing onto one line

sway-lib-std/src/raw_ptr.sw

@@ -163,19 +163,20 @@ impl raw_ptr {
     /// }
     /// ```
     pub fn write<T>(self, val: T) {
-        if __size_of::<T>() == 0 {    } else if __is_reference_type::<T>() {
-        asm(dst: self, src: val, count: __size_of_val(val)) {
-            mcp dst src count;
-        };
-    } else if __size_of::<T>() == 1 {
-        asm(ptr: self, val: val) {
-            sb ptr val i0;
-        };
-    } else {
-        asm(ptr: self, val: val) {
-            sw ptr val i0;
-        };
-    }
+        if __size_of::<T>() == 0 {
+        } else if __is_reference_type::<T>() {
+            asm(dst: self, src: val, count: __size_of_val(val)) {
+                mcp dst src count;
+            };
+        } else if __size_of::<T>() == 1 {
+            asm(ptr: self, val: val) {
+                sb ptr val i0;
+            };
+        } else {
+            asm(ptr: self, val: val) {
+                sw ptr val i0;
+            };
+        }
     }
 
     /// Writes the given byte to the address.

swayfmt/src/utils/language/expr/conditional.rs

@@ -159,7 +159,13 @@ fn format_then_block(
             formatter,
         )?;
         if !comments {
-            formatter.shape.block_unindent(&formatter.config);
+            if if_expr.else_opt.is_some()
+                && formatter.shape.code_line.line_style != LineStyle::Inline
+            {
+                writeln!(formatted_code)?;
+            } else {
+                formatter.shape.block_unindent(&formatter.config);
+            }
         }
     }
     if if_expr.else_opt.is_none() {

swayfmt/src/utils/language/expr/tests.rs

@@ -265,6 +265,16 @@ intermediate_whitespace
 let i = 42;
 }");
 
+fmt_test_expr!(empty_if_else_if
+"if __size_of::<T>() == 0 {
+} else if __is_reference_type::<T>() {
+    let i = 42;
+}",
+intermediate_whitespace
+"if __size_of::<T>() == 0 {    } else if __is_reference_type::<T>() {
+let i = 42;
+}");
+
 fmt_test_expr!(basic_for_loop
 "for iter in [0, 1, 7, 8, 15] {
     let i = 42;

swayfmt/tests/mod.rs

@@ -2113,6 +2113,52 @@ fn empty_if() {
     );
 }
 
+#[test]
+fn empty_if_else_if() {
+    check(
+        indoc! {r#"
+        library;
+        fn test() {
+            if __size_of::<T>() == 0 {    } else if __is_reference_type::<T>() {
+                let i = 42;
+            }
+        }
+        "#},
+        indoc! {r#"
+        library;
+        fn test() {
+            if __size_of::<T>() == 0 {
+            } else if __is_reference_type::<T>() {
+                let i = 42;
+            }
+        }
+        "#},
+    );
+}
+
+#[test]
+fn empty_if_with_else() {
+    check(
+        indoc! {r#"
+        library;
+        fn test() {
+            if some_really_long_condition_name_here() == 0 {    } else {
+                let really_long_variable_name = some_really_long_function_name();
+            }
+        }
+        "#},
+        indoc! {r#"
+        library;
+        fn test() {
+            if some_really_long_condition_name_here() == 0 {
+            } else {
+                let really_long_variable_name = some_really_long_function_name();
+            }
+        }
+        "#},
+    );
+}
+
 #[test]
 fn bug_whitespace_added_after_comment() {
     check(