Add test for #1187 (#4559)

Closes #1187

tests/data/cases/prefer_rhs_split_reformatted.py

@@ -11,6 +11,14 @@
 # exactly line length limit + 1, it won't be split like that.
 xxxxxxxxx_yyy_zzzzzzzz[xx.xxxxxx(x_yyy_zzzzzz.xxxxx[0]), x_yyy_zzzzzz.xxxxxx(xxxx=1)] = 1
 
+# Regression test for #1187
+print(
+    dict(
+        a=1,
+        b=2 if some_kind_of_data is not None else some_other_kind_of_data,  # some explanation of why this is actually necessary
+        c=3,
+    )
+)
 
 # output
 
@@ -36,3 +44,14 @@
 xxxxxxxxx_yyy_zzzzzzzz[
     xx.xxxxxx(x_yyy_zzzzzz.xxxxx[0]), x_yyy_zzzzzz.xxxxxx(xxxx=1)
 ] = 1
+
+# Regression test for #1187
+print(
+    dict(
+        a=1,
+        b=(
+            2 if some_kind_of_data is not None else some_other_kind_of_data
+        ),  # some explanation of why this is actually necessary
+        c=3,
+    )
+)