title: important hotkeys don't work anymore after RStudio update to 0.99.878
body: <p>I recently updated RStudio for Windows via <a href="https://download1.rstudio.org/RStudio-0.99.878.exe" rel="nofollow noreferrer">download link</a> mainly due to interest in the new features of the most recent version 0.99.878. Unfortunaly after the installation some important hotkeys behave different in the source editor, while they still work in the Console. I.e. </p>
  
  <p><kbd>Ctrl</kbd>+<kbd>S</kbd> starts an "isearch"
  <kbd>Ctrl</kbd>+<kbd>V</kbd> jumps to the end of the document</p>
  
  <p>When I enter <kbd>Ctrl</kbd>+<kbd>X</kbd>+(<kbd>S</kbd> or <kbd>V</kbd>) the hotkeys work as they should. The hotkeys can be customized, however when I open the Keyboard Shortcuts dialog it shows me the settings for the hotkeys.  Also the cursor has turned to a shiny green rectangle (<code>insert</code> isn't activated). </p>
  
  <p>The problems remains after switching the project. Also reinstalling Rstudio 0.99.878 didn't work out. I've seen a similar issue <a href="https://stackoverflow.com/questions/32017681/rstudio-cmd-c-v-not-working-in-editor">here</a>, but think mine is different as it is installation related. I might have accidentally activated a special editor setting but couldn't find any.</p>