~/Dropbox/TextExpander/Settings.textexpander
or
~/Library/Application\ Support/TextExpander/Settings.textexpander
add
<key>forcePasteBundleIDs</key>
<array><string>org.vim.MacVim</string></array>
~/Dropbox/TextExpander/Settings.textexpander
or
~/Library/Application\ Support/TextExpander/Settings.textexpander
add
<key>forcePasteBundleIDs</key>
<array><string>org.vim.MacVim</string></array>