Working with dependent PRs

You make a branch with some cool feature:

%%{init: { 'logLevel': 'debug', 'theme': 'base', 'gitGraph': {'showBranches': true, 'showCommitLabel':true,'mainBranchName': 'master'}} }%%
gitGraph
   commit
   branch feature-1
   commit
   commit
   commit
   checkout master

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Then you build another PR on top of that

%%{init: { 'logLevel': 'debug', 'theme': 'base', 'gitGraph': {'showBranches': true, 'showCommitLabel':true,'mainBranchName': 'master'}} }%%
gitGraph
   commit
   branch feature-1
   commit
   commit
   commit
   branch feature-2
   commit
   commit

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Then your first PR gets bors merged and squashed into a commit on staging

%%{init: { 'logLevel': 'debug', 'theme': 'base', 'gitGraph': {'showBranches': true, 'showCommitLabel':true,'mainBranchName': 'master'}} }%%
gitGraph
   commit
   branch feature-1
   commit
   commit
   commit type: HIGHLIGHT
   branch feature-2
   commit
   commit
   checkout master
   commit
   branch staging
   commit id: "someone-elses-feature1"
   commit id: "feature-1" type: HIGHLIGHT
   commit id: "someone-elses-feature2"

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And then bors finishes, deleting your branch

%%{init: { 'logLevel': 'debug', 'theme': 'base', 'gitGraph': {'showBranches': true, 'showCommitLabel':true,'mainBranchName': 'master'}} }%%
gitGraph
   commit
   branch "feature-1 (deleted)"
   commit
   commit
   commit type: HIGHLIGHT
   branch feature-2
   commit
   commit
   checkout master
   commit
   commit id: "someone-elses-feature1"
   commit id: "feature-1" type: HIGHLIGHT
   commit id: "someone-elses-feature2"

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Approach 1: merge³

Recreate the deleted branch, and git merge master. This merge should go through cleanly, but if it doesn't you should choose all the changes from master (TODO: what's the command for this?).

%%{init: { 'logLevel': 'debug', 'theme': 'base', 'gitGraph': {'showBranches': true, 'showCommitLabel':true,'mainBranchName': 'master'}} }%%
gitGraph
   commit
   branch feature-1
   commit
   commit
   commit type: HIGHLIGHT
   branch feature-2
   commit
   commit
   checkout master
   commit
   commit id: "someone-elses-feature1"
   commit id: "feature-1" type: HIGHLIGHT
   commit id: "someone-elses-feature2"
   checkout feature-1
   merge master

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Checkout your feature-2 branch, and git merge feature-1. This merge will contain only the actual conflicts

%%{init: { 'logLevel': 'debug', 'theme': 'base', 'gitGraph': {'showBranches': true, 'showCommitLabel':true,'mainBranchName': 'master'}} }%%
gitGraph
   commit
   branch feature-1
   commit
   commit
   commit type: HIGHLIGHT
   branch feature-2
   commit
   commit
   checkout master
   commit
   commit id: "someone-elses-feature1"
   commit id: "feature-1" type: HIGHLIGHT
   commit id: "someone-elses-feature2"
   checkout feature-1
   merge master
   checkout feature-2
   merge feature-1

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