A Pull Request is often just the start of a longer process of patching and refining the code until it's ready to merge. In that process it's common to accumulate a lot of commits, some of which are non-functional. Before merging any PR, excess commits need to be "squashed" and sometimes rearranged or reworked to produce a well-packaged set of changes and keep the commit history relatively clean.
In addition, while a PR is being worked on other commits may be merged, leading to conflicts that need resolution. For this reason, it's a best practice to periodically refresh the PR so the working copy closely reflects the final merge.
I recommend not using Github Desktop to sync and merge. Use the command line instead. Github Desktop provides a "merge" option, but for best results "`git rebase`" is recommended. Merge applies new work after your commits. This buries them and makes it hard to bring them together as a final packaged unit. Rebase moves your commits to the end of the branch, ensuring that your commits will be adapted to the current code. This makes it easier to keep revising the commits in-place.
mfadd [user]|Add Remote - Add another Github user's fork of Marlin as a remote, then fetch it. After this you can check out one of their branches and either make a PR targeted at their fork or targeted at `bugfix-1.1.x`.
mfinit|Init Working Copy - Creates a remote named '`upstream`' (for use by the other scripts) pointing to the '`MarlinFirmware`' fork. Use once after checking out your fork.
firstpush|Push the current branch to 'origin' -your fork on Github- and set it to track '`origin`'. The branch needs to reside on Github before you can use it to make a PR.
mfdoc|Build the documentation and preview it locally.
mfpub|Build the documentation and publish it to marlinfw.org via Github.
#### Utilities
File|Description
----|-----------
ghtp -[h/s]|Set the protocol to use for all remotes. -h for HTTPS, -s for SSL.
mfinfo|This utility script is used by the other scripts to get:<br/>- The upstream project ('`MarlinFirmware`')<br/>- the '`origin`' project (i.e., your Github username),<br/>- the repository name ('`Marlin`'),<br/>- the PR target branch ('`bugfix-1.1.x`'), and<br/>- the current branch (or the first command-line argument).<br/><br/>By itself, `mfinfo` simply prints these values to the console.
mfclean |Prune your merged and remotely-deleted branches.
