Commits on Jan 3, 2022

1. improve collapsing of duplicate properties …

   In theory, we don't have to do anything because the browser is smart
   enough to figure everything out. However, leaving in duplicate
   properties is not that ideal for file size.
   
   Our previous method was pretty simple: if you see a declaration you
   already saw in this rule, delete the previous one and keep the current
   one.
   
   This works pretty well, but this gets rid of **all** the declarations
   with the same property. This is not great for overrides for older
   browsers.
   
   In a perfect world, we can handle this based on your target browser but
   this is a lot of unnecessary complexity and will slow things down
   performance wise.
   
   Alternative, we improved the solution by being a bit smarter:
   1. Delete duplicate declarations that have the same property and value
      (this will get rid of **exact** duplications).
   2. Delete declarations with the same property and the same **unit**.
   
   This means that we will reduce this:
   ```css
   .example {
     height: 50%;
     height: 100px;
     height: 20vh;
     height: 30%;
     height: 50px;
     height: 30vh;
     transform: var(--value);
     transform: var(--value);
   }
   ```
   
   To:
   ```diff-css
     .example {
   -   height: 50%;    /* Another height exists later with a `%` unit */
   -   height: 100px;  /* Another height exists later with a `px` unit */
   -   height: 20vh;   /* Another height exists later with a `vh` unit */
       height: 30%;
       height: 50px;
       height: 30vh;
   -   transform: var(--value); /* Value is too complex, but is **exactly** the same as the one below */
       transform: var(--value);
     }
   ```
   
   This will reduce the values that we are 100% sure that can be safely
   removed. This will still result in some overrides but the browser can
   handle those for you.
   
   Fixes: #6844

   

   RobinMalfait committed Jan 3, 2022
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   d99ff19 View commit details

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2. update changelog

   

   RobinMalfait committed Jan 3, 2022
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   99748d5 View commit details

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