C-style compound assignment `>>=` `<<=` `||=` `|=` are not combined with equal sign by default. Old behavior is moved into `ss09` (closes #974)

CHANGELOG.md

@@ -7,8 +7,8 @@ All notable changes to this project will be documented in this file.
 - Fixed height of `∑` U+2211 N-ARY SUMMATION #1083
 - Added U+2241..U+224B `≁ ≂ ≃ ≄ ≅ ≆ ≇ ≉ ≊ ≋` #1090
 - Added new enclosed characters from Unicode 13 U+0229C `⊜`, U+1F10D `🄍`, U+1F10E `🄎`, U+1F10F `🄏`, U+1F16D `🅭`, U+1F16E `🅮`, U+1F16F `🅯`, U+1F1AD `🆭` #1070
-- Redrew U+27F0..U+27FF Supplemental Arrows-A to be strict monospace `⟲⟳⟴⟵⟶⟷⟸⟹⟺⟻⟼⟽⟾⟿`
-- Alternative `a` cv01
+- Redrew U+27F0..U+27FF Supplemental Arrows-A to be strict monospace `⟲⟳⟴⟵⟶⟷⟸⟹⟺⟻⟼⟽⟾⟿` #1109 #1123
+- Alternative `a` cv01 #949
 - Alternative `g` cv02 #886
 - Alternative `i` cv03-cv06
 - Alternative `l` cv07-cv10 #899
@@ -23,7 +23,9 @@ All notable changes to this project will be documented in this file.
 - `=<` as less than or equal `cv21` #34
 - `=<` as less than or equal with horizontal bar `cv22` #34
 - `>=` with a horizontal bar `cv23`
-- Moved `.-` into `dlig` #1103
+- Moved `.-` into `dlig` #860 #1103
+- Returned `[]` as `dlig`
+- C-style compound assignment `>>=` `<<=` `||=` `|=` are not combined with equal sign by default. Old behavior is moved into `ss09` #974
 
 #### 5.2 (June 12, 2020)
 
@@ -146,7 +148,7 @@ Removed 44 individual arrow ligatures, replaced with four universal, combinative
 - Alternatives (stylistic sets):
   - Lowercase `r` (ss01) [#601]
   - Less than/greater than `<=` `>=` (ss02) [#263] [#617]
-  - Ampersand `&` (ss03) [#617]
+  - Ampersand `&` (ss03) [#371] [#617] 
   - Dollar sign `$` (ss04) [#617]
   - At sign `@` (ss05) [#617] [#748] [#817]
   - Thin backslash (ss06) [#577 #720 #825]

clojure/fira_code/calt.clj

@@ -158,19 +158,25 @@
          "  ignore sub greater' equal [less greater bar colon exclam slash];\n")
 
     ;; #346 >>->> >>=>>
+    ;; #974 keep >>=
     ["greater" "greater"]
     (str "  ignore sub [hyphen equal] greater' greater;\n"
-         "  ignore sub greater' greater [hyphen equal];\n")
+         "  ignore sub greater' greater hyphen;\n"
+         "  ignore sub greater' greater equal [equal less greater bar colon exclam slash];\n")
 
     ;; #346 <<-<< <<=<<
+    ;; #974 keep <<=
     ["less" "less"]
     (str "  ignore sub [hyphen equal] less' less;\n"
-         "  ignore sub less' less [hyphen equal];\n")
+         "  ignore sub less' less hyphen;\n"
+         "  ignore sub less' less equal [equal less greater bar colon exclam slash];\n")
 
     ;; #346 ||-|| ||=||
+    ;; #974 keep ||=
     ["bar" "bar"]
     (str "  ignore sub [hyphen equal] bar' bar;\n"
-         "  ignore sub bar' bar [hyphen equal];\n")
+         "  ignore sub bar' bar hyphen;\n"
+         "  ignore sub bar' bar equal [equal less greater bar colon exclam slash];\n")
 
     ;; #816 //=
     ["slash" "slash"]

features/calt/equal_arrows.fea

@@ -66,7 +66,7 @@ lookup equal_arrows {
   # single beginnings
   sub less'    equal by less_equal_start.seq;
   sub greater' equal by greater_equal_start.seq;
-  sub bar'     equal by bar_equal_start.seq;
+  sub bar'     equal [equal less greater bar colon exclam slash] by bar_equal_start.seq; # disable |= 
   sub slash'   equal by slash_equal_start.seq;
   sub equal'  [equal greater bar colon exclam] by equal_start.seq;
 

features/ss09.fea

@@ -0,0 +1,19 @@
+lookup restore_greater_greater_equal {
+  sub greater_greater_equal_start.seq equal' by equal_end.seq;
+  sub greater_greater.liga' equal by greater_greater_equal_start.seq;
+} restore_greater_greater_equal;
+
+lookup restore_less_less_equal {
+  sub less_less_equal_start.seq equal' by equal_end.seq;
+  sub less_less.liga' equal by less_less_equal_start.seq;
+} restore_less_less_equal;
+
+lookup restore_bar_bar_equal {
+  sub bar_bar_equal_start.seq equal' by equal_end.seq;
+  sub bar_bar.liga' equal by bar_bar_equal_start.seq;
+} restore_bar_bar_equal;
+
+lookup restore_bar_equal {
+  sub bar_equal_start.seq equal' by equal_end.seq;
+  sub bar' equal by bar_equal_start.seq;
+} restore_bar_equal;