From 297463987703f2c02e3a0e2f905fdc55e883cbca Mon Sep 17 00:00:00 2001
From: Ron Kok <ronkok@comcast.net>
Date: Sun, 27 May 2018 19:28:02 -0700
Subject: [PATCH] Fix coloneq etc (#1372)

Fix issue #1333.

`\coloneq` and several similar functions are written as macros. When expanded, these result in atoms like ":" and "=" placed adjacent to each other at the top level. So they exposed to a split by an automatic line break.

This PR wraps each of these macros in an `\mathrel{ }`. This prevents the line break.
---
 src/macros.js | 44 +++++++++++++++++++++++++++-----------------
 1 file changed, 27 insertions(+), 17 deletions(-)

diff --git a/src/macros.js b/src/macros.js
index ab2ee074..88458bbc 100644
--- a/src/macros.js
+++ b/src/macros.js
@@ -464,31 +464,38 @@ defineMacro("\\ordinarycolon", ":");
 //TODO(edemaine): Not yet centered. Fix via \raisebox or #726
 defineMacro("\\vcentcolon", "\\mathrel{\\mathop\\ordinarycolon}");
 // \providecommand*\dblcolon{\vcentcolon\mathrel{\mkern-.9mu}\vcentcolon}
-defineMacro("\\dblcolon", "\\vcentcolon\\mathrel{\\mkern-.9mu}\\vcentcolon");
+defineMacro("\\dblcolon",
+    "\\mathrel{\\vcentcolon\\mathrel{\\mkern-.9mu}\\vcentcolon}");
 // \providecommand*\coloneqq{\vcentcolon\mathrel{\mkern-1.2mu}=}
-defineMacro("\\coloneqq", "\\vcentcolon\\mathrel{\\mkern-1.2mu}=");
+defineMacro("\\coloneqq", "\\mathrel{\\vcentcolon\\mathrel{\\mkern-1.2mu}=}");
 // \providecommand*\Coloneqq{\dblcolon\mathrel{\mkern-1.2mu}=}
-defineMacro("\\Coloneqq", "\\dblcolon\\mathrel{\\mkern-1.2mu}=");
+defineMacro("\\Coloneqq", "\\mathrel{\\dblcolon\\mathrel{\\mkern-1.2mu}=}");
 // \providecommand*\coloneq{\vcentcolon\mathrel{\mkern-1.2mu}\mathrel{-}}
-defineMacro("\\coloneq", "\\vcentcolon\\mathrel{\\mkern-1.2mu}\\mathrel{-}");
+defineMacro("\\coloneq",
+    "\\mathrel{\\vcentcolon\\mathrel{\\mkern-1.2mu}\\mathrel{-}}");
 // \providecommand*\Coloneq{\dblcolon\mathrel{\mkern-1.2mu}\mathrel{-}}
-defineMacro("\\Coloneq", "\\dblcolon\\mathrel{\\mkern-1.2mu}\\mathrel{-}");
+defineMacro("\\Coloneq",
+    "\\mathrel{\\dblcolon\\mathrel{\\mkern-1.2mu}\\mathrel{-}}");
 // \providecommand*\eqqcolon{=\mathrel{\mkern-1.2mu}\vcentcolon}
-defineMacro("\\eqqcolon", "=\\mathrel{\\mkern-1.2mu}\\vcentcolon");
+defineMacro("\\eqqcolon", "\\mathrel{=\\mathrel{\\mkern-1.2mu}\\vcentcolon}");
 // \providecommand*\Eqqcolon{=\mathrel{\mkern-1.2mu}\dblcolon}
-defineMacro("\\Eqqcolon", "=\\mathrel{\\mkern-1.2mu}\\dblcolon");
+defineMacro("\\Eqqcolon", "\\mathrel{=\\mathrel{\\mkern-1.2mu}\\dblcolon}");
 // \providecommand*\eqcolon{\mathrel{-}\mathrel{\mkern-1.2mu}\vcentcolon}
-defineMacro("\\eqcolon", "\\mathrel{-}\\mathrel{\\mkern-1.2mu}\\vcentcolon");
+defineMacro("\\eqcolon",
+    "\\mathrel{\\mathrel{-}\\mathrel{\\mkern-1.2mu}\\vcentcolon}");
 // \providecommand*\Eqcolon{\mathrel{-}\mathrel{\mkern-1.2mu}\dblcolon}
-defineMacro("\\Eqcolon", "\\mathrel{-}\\mathrel{\\mkern-1.2mu}\\dblcolon");
+defineMacro("\\Eqcolon",
+    "\\mathrel{\\mathrel{-}\\mathrel{\\mkern-1.2mu}\\dblcolon}");
 // \providecommand*\colonapprox{\vcentcolon\mathrel{\mkern-1.2mu}\approx}
-defineMacro("\\colonapprox", "\\vcentcolon\\mathrel{\\mkern-1.2mu}\\approx");
+defineMacro("\\colonapprox",
+    "\\mathrel{\\vcentcolon\\mathrel{\\mkern-1.2mu}\\approx}");
 // \providecommand*\Colonapprox{\dblcolon\mathrel{\mkern-1.2mu}\approx}
-defineMacro("\\Colonapprox", "\\dblcolon\\mathrel{\\mkern-1.2mu}\\approx");
+defineMacro("\\Colonapprox",
+    "\\mathrel{\\dblcolon\\mathrel{\\mkern-1.2mu}\\approx}");
 // \providecommand*\colonsim{\vcentcolon\mathrel{\mkern-1.2mu}\sim}
-defineMacro("\\colonsim", "\\vcentcolon\\mathrel{\\mkern-1.2mu}\\sim");
+defineMacro("\\colonsim", "\\mathrel{\\vcentcolon\\mathrel{\\mkern-1.2mu}\\sim}");
 // \providecommand*\Colonsim{\dblcolon\mathrel{\mkern-1.2mu}\sim}
-defineMacro("\\Colonsim", "\\dblcolon\\mathrel{\\mkern-1.2mu}\\sim");
+defineMacro("\\Colonsim", "\\mathrel{\\dblcolon\\mathrel{\\mkern-1.2mu}\\sim}");
 
 // Some Unicode characters are implemented with macros to mathtools functions.
 defineMacro("\u2254", "\\coloneqq");  // :=
@@ -515,11 +522,14 @@ defineMacro("\\coloncolonapprox", "\\Colonapprox");
 defineMacro("\\coloncolonsim", "\\Colonsim");
 
 // Additional macros, implemented by analogy with mathtools definitions:
-defineMacro("\\simcolon", "\\sim\\mathrel{\\mkern-1.2mu}\\vcentcolon");
-defineMacro("\\simcoloncolon", "\\sim\\mathrel{\\mkern-1.2mu}\\dblcolon");
-defineMacro("\\approxcolon", "\\approx\\mathrel{\\mkern-1.2mu}\\vcentcolon");
+defineMacro("\\simcolon",
+    "\\mathrel{\\sim\\mathrel{\\mkern-1.2mu}\\vcentcolon}");
+defineMacro("\\simcoloncolon",
+    "\\mathrel{\\sim\\mathrel{\\mkern-1.2mu}\\dblcolon}");
+defineMacro("\\approxcolon",
+    "\\mathrel{\\approx\\mathrel{\\mkern-1.2mu}\\vcentcolon}");
 defineMacro("\\approxcoloncolon",
-            "\\approx\\mathrel{\\mkern-1.2mu}\\dblcolon");
+            "\\mathrel{\\approx\\mathrel{\\mkern-1.2mu}\\dblcolon}");
 
 // Present in newtxmath, pxfonts and txfonts
 // TODO: The unicode character U+220C ∌ should be added to the font, and this