revert to uglify to fix color picker failure

to close #791

Author: Dave Conway-Jones

gulpfile.js

@@ -20,7 +20,7 @@ var
     rename = require('gulp-rename'),
     replace = require('gulp-replace'),
     sass = require('gulp-sass')(require('sass')),
-    terser = require('gulp-terser'),
+    uglify = require('gulp-uglify'),
     gutil = require('gulp-util'),
     path = require('path'),
     streamqueue = require('streamqueue');
@@ -81,7 +81,7 @@ function js() {
         .pipe(gulp.dest('dist/'));
 
     return streamqueue({ objectMode:true }, scripts, templates)
-        .pipe(gulpif(/[.]min[.]js$/, gutil.noop(), terser()))
+        .pipe(gulpif(/[.]min[.]js$/, gutil.noop(), uglify()))
         .pipe(concat('app.min.js'))
         .pipe(header(fs.readFileSync('license.js')))
         .pipe(eol('\n'))

src/gridstack-extra.scss

@@ -14,10 +14,10 @@ $gridstack-columns: 11 !default;
       min-width: calc(100% / $columns);
 
       @for $i from 1 through $columns {
-        &[data-gs-width='#{$i}'] { width: calc(100% / $columns) * $i; }
-        &[data-gs-x='#{$i}'] { left: calc(100% / $columns) * $i; }
-        &[data-gs-min-width='#{$i}'] { min-width: calc(100% / $columns) * $i; }
-        &[data-gs-max-width='#{$i}'] { max-width: calc(100% / $columns) * $i; }
+        &[data-gs-width='#{$i}'] { width: calc(100% / $columns * $i); }
+        &[data-gs-x='#{$i}'] { left: calc(100% / $columns * $i); }
+        &[data-gs-min-width='#{$i}'] { min-width: calc(100% / $columns * $i); }
+        &[data-gs-max-width='#{$i}'] { max-width: calc(100% / $columns * $i); }
       }
     }
   }