Avoid space before completion in mathed

This can happen if the current element has space after it (e.g. before
a relation).

Fixes bug #11283.

(cherry picked from commit 1b5ccecd65)

src/mathed/MathRow.cpp

@@ -381,12 +381,14 @@ void MathRow::draw(PainterInfo & pi, int x, int const y) const
 
 		if (!s1.empty()) {
 			f.setColor(Color_inlinecompletion);
-			pi.pain.text(x, y, s1, f);
+			// offset the text by e.after to make sure that the
+			// spacing is after the completion, not before.
+			pi.pain.text(x - e.after, y, s1, f);
 			x += mathed_string_width(f, s1);
 		}
 		if (!s2.empty()) {
 			f.setColor(Color_nonunique_inlinecompletion);
-			pi.pain.text(x, y, s2, f);
+			pi.pain.text(x - e.after, y, s2, f);
 			x += mathed_string_width(f, s2);
 		}
 	}

status.23x

@@ -126,6 +126,7 @@ What's new
 
 - Improve automatic removal of extra spaces, aka DEPM (bug 10503).
 
+- Avoid white space before math completion (bug 11283).
 
 
 * INTERNALS