Revert "Don't use show_window for viewers"

This reverts commit 951c43d, fixing #1309

Author: ig0774

viewers/command_viewer.py

@@ -19,6 +19,9 @@
     strbase = basestring
 
 
+WINDOWS_SHELL = re.compile(r'\b(?:cmd|powershell)(?:.exe)?\b', re.UNICODE)
+
+
 # a viewer that runs a user-specified command
 class CommandViewer(BaseViewer):
 
@@ -123,7 +126,11 @@ def _run_command(self, command, pdf_file, tex_file=None, line='', col=''):
 
         external_command(
             command,
-            cwd=os.path.split(pdf_file)[0]
+            cwd=os.path.split(pdf_file)[0],
+            # show the Window if not using a Windows shell, i.e., powershell or
+            # cmd
+            show_window=not bool(WINDOWS_SHELL.match(command[0]))
+            if sublime.platform() == 'windows' else False
         )
 
     def forward_sync(self, pdf_file, tex_file, line, col, **kwargs):

viewers/sumatra_viewer.py

@@ -99,7 +99,7 @@ def _error_msg():
         try:
             external_command(
                 [sumatra_binary] + commands,
-                use_texpath=False
+                use_texpath=False, show_window=True
             )
         except OSError:
             exc_info = sys.exc_info()
@@ -109,7 +109,7 @@ def _error_msg():
                 try:
                     external_command(
                         [sumatra_exe] + commands,
-                        use_texpath=False
+                        use_texpath=False, show_window=True
                     )
                 except OSError:
                     traceback.print_exc()