diff --git a/spec/text-editor-spec.js b/spec/text-editor-spec.js
index 89af72137..ab84d88c8 100644
--- a/spec/text-editor-spec.js
+++ b/spec/text-editor-spec.js
@@ -20,6 +20,17 @@ describe('TextEditor', () => {
     await atom.packages.activatePackage('language-javascript')
   })
 
+  it('generates unique ids for each editor', async () => {
+    // Deserialized editors are initialized with the serialized id. We can
+    // initialize an editor with what we expect to be the next id:
+    const deserialized = new TextEditor({id: editor.id+1})
+    expect(deserialized.id).toEqual(editor.id+1)
+
+    // The id generator should skip the id used up by the deserialized one:
+    const fresh = new TextEditor()
+    expect(fresh.id).toNotEqual(deserialized.id)
+  })
+
   describe('when the editor is deserialized', () => {
     it('restores selections and folds based on markers in the buffer', async () => {
       editor.setSelectedBufferRange([[1, 2], [3, 4]])
diff --git a/src/main-process/atom-application.coffee b/src/main-process/atom-application.coffee
index 8e889ecca..e0d2d691f 100644
--- a/src/main-process/atom-application.coffee
+++ b/src/main-process/atom-application.coffee
@@ -38,12 +38,15 @@ class AtomApplication
       # Lowercasing the ATOM_HOME to make sure that we don't get multiple sockets
       # on case-insensitive filesystems due to arbitrary case differences in paths.
       atomHomeUnique = path.resolve(process.env.ATOM_HOME).toLowerCase()
-      hash = crypto.createHash('sha1').update(username).update('|').update(atomHomeUnique)
-      atomInstanceDigest = hash.digest('hex').substring(0, 32)
+      hash = crypto.createHash('sha1').update(options.version).update('|').update(process.arch).update('|').update(username).update('|').update(atomHomeUnique)
+      # We only keep the first 12 characters of the hash as not to have excessively long
+      # socket file. Note that macOS/BSD limit the length of socket file paths (see #15081).
+      # The replace calls convert the digest into "URL and Filename Safe" encoding (see RFC 4648).
+      atomInstanceDigest = hash.digest('base64').substring(0, 12).replace(/\+/g, '-').replace(/\//g, '_')
       if process.platform is 'win32'
-        options.socketPath = "\\\\.\\pipe\\atom-#{options.version}-#{process.arch}-#{atomInstanceDigest}-sock"
+        options.socketPath = "\\\\.\\pipe\\atom-#{atomInstanceDigest}-sock"
       else
-        options.socketPath = path.join(os.tmpdir(), "atom-#{options.version}-#{process.arch}-#{atomInstanceDigest}.sock")
+        options.socketPath = path.join(os.tmpdir(), "atom-#{atomInstanceDigest}.sock")
 
     # FIXME: Sometimes when socketPath doesn't exist, net.connect would strangely
     # take a few seconds to trigger 'error' event, it could be a bug of node
diff --git a/src/text-editor.js b/src/text-editor.js
index fc2d6acd3..dcf8e201e 100644
--- a/src/text-editor.js
+++ b/src/text-editor.js
@@ -119,6 +119,10 @@ class TextEditor {
     }
 
     this.id = params.id != null ? params.id : nextId++
+    if (this.id >= nextId) {
+      // Ensure that new editors get unique ids:
+      nextId = this.id + 1
+    }
     this.initialScrollTopRow = params.initialScrollTopRow
     this.initialScrollLeftColumn = params.initialScrollLeftColumn
     this.decorationManager = params.decorationManager